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to insert ones "gear" (penis) in conjunction with a females reproductive organs. also known as sexual intercourse. can also refer to anal sex when appropriate.

the penetration of ones male reproductive organ (cock) into a body cavity.
he was doosin' her flat out last night.
cant wait to doose that sheela
im so tired from being up late doosing.
i live for doosin' women.
David can and will be the king of doosin'
i would rather be doosin' her in the bum
by phill hinz August 13, 2012