A male homosexual who has yet to come out of the closet (or trunk).
A Scottish slang term for a male homosexual.
For example,

1. Did you see Dave looking at that bloke, I think he is a bit of a trunk monkey.
2. I feel sorry for Dave that he hasn't come to terms with his sexuality yet. He still tries to make his friends think he likes girls, but we all know he's a trunk monkey!
by Dick Splash 2 June 13, 2009
A small primate usually of the chimpanzee variaty that tends to jump from ones trunk and kick peoples asses.
I recently installed a trunk monkey button in my car to take out my old boss.
by porrasturvat jr. January 01, 2004
Consisting solely of a trained monkey and a steady source of ice cold high-quality ale or lager, the Trunkmonkey lives in the trunk of any vehicle and helps to automate weight transfer at the rear wheels during spirited driving maneuvers. Trunkmonkeys distribute ballast in the trunk of a car to compensate for body roll going through corners and powerslides. Trunkmonkeys are also responsible for keeping body roll to a minimum when getting the vehicle airborne during rallies and other offroad events.

Originally developed for Subaru models, STIT (Subaru Trunkmonkey Inertia Technology) is currently being developed for other platforms. (trunkmonkey.com)
Me: Alex, how did your RS beat that Lotus in the autocross?

Alex: IDK, i guess my trunkmonkey kept me stuck around the corners and gave me the extra boost i needed.
by BLo January 11, 2006
The WSO (backseater) in a fighter jet, named because they sit behind the pilot ("stick monkey")
"You're my favorite trunk monkey to fly with."
"Goose was Maverick's trunk monkey."
by Desert_Eagle October 20, 2006
Consisting solely of a trained monkey and a steady source of ice cold high-quality import ale or lager, the Trunkmonkey lives in the trunk of any vehicle and helps to automate weight transfer at the rear wheels during spirited driving maneuvers.
I stuffed it coming out of that three right tightens because my Trunkmonkey was asleep. Bad Trunkmonkey, no biscuit!
by Trunkmonkey July 07, 2004
opposite of "boo" or "beau". asshole, dickhead,fucker. all not nice things to say to people rolled into one word.
man, you're a fuckin' trunk-monkey for leavin' me at the club!
by shalae December 29, 2004
a girl who loves anal sex
I couldn't believe how much of a trunk monkey that girl was.
by Chris Colbeck May 11, 2005
Trunk Monkey is a term used when talking about a women's urge to have hevy sex. The term is used usually when talking about the ting-a-ling feeling in a girls vigina, right before she has sex with someone.
guy 1-"that party was crazy"!
guy 2-"that girl was hitting on you so much"!
guy 1-"why was she all over me tonight"?
guy 2-"cause her trunk monkey wanted out"
by chips\ahoy June 28, 2009

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