Having sex with one's anus to the point where the anus and colon become distended, and protrude out of the body, and then performing oral sex on the length of protruding anus.
Me and Charlize were stone cold trunkin'.

Nathan is a good guy because he knows how to trunk some anus.
by Dr. Turbo April 9, 2005
to consume cocaine by allowing it to permeate through the foreskin of the penis,
"G dub, Buzzsaw, Tha Wind an' me were trunking an eight ball at Vito's last nite."
by Mother Trunker November 14, 2008
a shenanigan in which a teenage miscreant sneaks up to a stopped car at an intersection and opens the trunk of the car. a sucessful trunk happens only when the door is unlocked and the trunk opens.
Last night we went trunking and opened 4 guys trunks!
by Ninja Guin May 6, 2009
The latest craze amongst American teens when there are too many bodies to conventionally fit inside a car - the extras go into the car trunk (or boot if you speak British English).
Yeah, man, Mark and I went trunking last night, because there were 8 of us, and damn his feet stink!
by Doc Tinfoil Hat June 17, 2006
the act of anal sex.

see wordtrunk/word
George was well known among the ladies for his ability to deliver a good trunking.
by Wolfman August 9, 2003
The act of fucking the trunk of a dead (or live) elephant.

This feat can only be done by a man. Strap-ons DO NOT COUNT ladies.
Ponsonby and the rest of the English aristocrats on African safari have just killed an old male elephant, and there is no doubt that the first thought in their minds was to trunk for the rest of the afternoon. This abomination included barons and earls of high society viciously blitzkrieging their dicks up the formidable nasal instrument of Earth's finest beast.

Trunking with a live elephant, while not totally out of the question, has never been done.
by Caligulananda August 25, 2010
A dog fight held in a closed car trunk. The trunk is closed for 15 to 30 minutes before they open it. The dog left alive is the winner. This method is used because it is hard for police to detect and even more difficult to prosecute.
The neighbors were accused of trunking.
by harus August 26, 2008