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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 25, 2011
Used in Uganda in Swahili as a term of admiration towards women. The most common translation being 'beautiful'.
"en ku phet weem, tilh ku a-poop." - "this is my wife she is beautiful"
by FairyKing101 November 18, 2013