Top Definition
Following the urban legend that lifting weights while maintaining a full erection leads to an increase in penis length and faster muscle growth elsewhere, 'stiff lifts' describes the activity of lifting free weights while deliberately maintaining an erection, often through use of pornography.
Jeff: "mate my muscles just aren't growing"

Chris: "Have you tried stiff lifts? I know one muscle I'm improving..."
by GrumpyBint June 10, 2013

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