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When you tell a really shit joke, do a stupid dance, or just be a general twat, then your doing a Simpkin
Oh God, Dave's doing a Simpkin on us.
by Vortex April 03, 2004
A simpkin is also when a guy tries to pull a girl with a 70s rollerdance and fails miserbaly
George tried a Simpkin, but got him nowhere
by Bling_Master April 05, 2004