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1.
When a male repeatedly slaps a females breast with his erect penis.
Jim, I heard you gave Samantha a drummer boy last night when you were having sex.
by OJProductions August 18, 2006
 
2.
(noun) A traditional Christmas song. The drummer boy had no gift for the baby Jesus, so instead he played "pa-rom-pop-pom-pom" on his drum.
Drumma boyz!
by Fangsta December 15, 2003