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A blowjob.
get down on your knees and smile like a donut.
by Tony December 08, 2003
A smile in the shape of a donut's hole.
Smiling in this manner greatly resembles pre-fellatio mouth arrangement.

Hey Bro, smile like a donut and close your eyes. We'll play some gamecube.

Girl, I gots that feelin'. Wouldja be cool and donut smile? Do it now.
by Hotsk8terboy25 November 28, 2007