1. Astern; Behind a ship; At or toward the stern of a ship.

2. Slang for being trailed by a member of the same sex, usually male to male.
"Aye, the tug boat is apoop of the Queen Elizabeth"

"Don't look now bro, but remember that guy at the bar? He is totally apoop of you as we speak."
by Abnertown September 26, 2011
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