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2.
to fondle with a member of the fairer sex, to touch her tits or fanny
I ulled a slut last night I didnt shag her just let her tamper with my cock
by Pablo Escobar January 11, 2004
 
1.
to interfere with, to meddle
It's important not to tamper with unknown chemicals in a science lab.
by Rocking4god April 12, 2007