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1.
The male who is responsible for inviting along female companions when a group of males decide to go out. The Ass Captain has no other responsibility other than to ensure the women show up for the evening.
Joe is the Ass Captain for the night since he met a group of girls on the Internet last night and they agreed to roll out with us.
by Epic909 March 28, 2004
 
2.
1. One who deems it necessary to boss people around for the sake of shameless self-amusement.
2. One who seeks ass of any kind.
3. One who captains the ass.
Brad should stop telling me what to do. I'm sick of him being an asscaptain.
by Matt Heston June 21, 2006
 
3.
1. One who takes charge of and dominates asses like a despot.

2. The nemisis of the asspirate. Although their goals are similar they are loathe to share the ass-sea.

3. A man who loves ass-sex, but unlike the asspirate the ass captain in purely homosexual.
1. "I can't believe the way roberto lets mantooth captain his ass like that"

2. Asscaptain McClendon glared at his arch nemesis, the dred asspirate Roberts.
"I'll be damned if I share this eerr ass-ocean yee," exclaimed the insatiable Roberts.
"Then battle for the ass we must!" retorted McClendon.

3. "Man o man do I singularily love to tyranize a man's ass," said the asscaptain.
by Matuea October 08, 2006
 
4.
1. One who deems it necessary to boss people around for the sake of shameless self-amusement.
2. One who seeks ass of any kind.
3. One who captains the ass.
Brad should stop telling me what to do, I'm sick of him being an asscaptain.
by Matt Heston June 24, 2006
 
5.
very very very gay man.

In a group of men the man who decides to invite girls to where ever you are going.

very gay man on a boat.

"if I told you i was an ass captain, would you swab my poopdeck?"

"and dorian is the designated ass captain for the night"
by Undie Bundie September 23, 2007
 
6.
Someone, usually a male, who enjoys to have sex with either a lady or man in the anal area of the body.
Ooh, I would love be the ass captain of your anus
by - Ian July 29, 2006