Reading through the forums of Trollcall.net I found these troll slang and swear words. If you are easily shocked or offended I suggest you do not read further.
One of the most versatile words in the Zandali language. Vekk actually means crooked, dishonourable, but it is used as an expletive for all occasions.
Example - In Uldaman, the over-confident orc warrior in your party charges forward into a room and is attacked by seven dwarves at the same time. In the battle that follows everyone in the party comes close to being killed.
"Vekk! What the vekk are you doin', mon? You almos' got us killed, you vekking piece of vask."
A noun that means excrement. Vask is used to describe something that is unpleasant or worthless.
Example - A troublesome guild-mate tells you that he has been given special voodoo powers by the High Priest of a long-lost tribe of trolls.
"Hah! Dat is da biggest cart-load of vask I ever heard."
A Zandali word for a noxious insect, used to describe any horrible creature. Being compared to one is not a compliment.
Example - A Forsaken with glowing eyes keeps pestering you to give him some gold.
"Get away from me, you rotting offspring of a jillik!"
An old Zandali word meaning the Nether (the spirit world outside the troll heaven). It is roughly equivalent to the word 'Hell'.
Example - Zanick is following a companion who is leading the way through a dungeon he says he knows well, when they drop down into a deep foul-smelling stream.
"Where in naraka have you led us, you murka? Dere's vask up to my ku'ca and dere's no vekking way to get out!"
A Zandali word for an inexperienced or foolish person.
Example - A tauren recruits you to help him fight his way through the Cathedral in the Scarlet Monastery, but when you get there he admits he can't find the key to the Cathedral gates.
"You vekking murka, Blackhorn! Now we has ta go lookin' for da key!"
Zandali slang for breasts.
Example - An orc in the Orgrimmar auction house has been staring at Zanick for some time, and she's finally become annoyed.
"Hey, green-skin! Stop starin' at my ku'ca or I'll come over dere and slap you so hard you'll be pickin' your tusks out of da wall."
Insult implying that a female has loose morals or is of negotiable affection.
Example - Zanick is trying to get some information from Doyo'da in Gryshka's Inn in Orgrimmar when he wanders outside to watch the dancing of a scantily-clad female troll, to Zanick's annoyance.
"I can't believe he's chasin' after dat skinny little puccha! She's leadin' 'im around by the draks!"
( A stronger word than 'puccha' is 'zuni', which means a female dog.)
A Zandali slang word for an intimate male body part. (Males usually have two of them.)
Example - A female troll convinces Djinja to lend her some gold, promising to pay him back later, but Zanick doubts he will ever see his money again.
"Hey, mon. She wouldn't have tricked you if you'd been tinkin' wiv your head instead o' your draks."
Someone who isn't the sharpest sword in the armoury. An unintelligent person.
Example - Your party decides to travel from Orgrimmar to Undercity to go adventuring in Shadowfang Keep. The orc warrior, arriving late, accidentally takes the zeppelin to Grom'gol by mistake.
"What a ja'da! It's already sunset an' we'll hav ta waste even more time waitin' for 'im to catch up."
What other troll speak have you heard of? Anyway, peruse the list, sprinkle the words in liberally and enjoy!