A term meaning sex and/or hand jobs, depending on how it is used. If someone offers you a guitar lesson, it means they are offering you sex or some "strum fun". During the guitar lesson analogy, condoms are referred to as pleactrums.
Person one: Hey, fancy meeting my in the music cupboard later for a... guitar lesson? I fancy strumming the guitar ;)

Person two: No sorry, no strum fun for my today, I don't have a plectrum on me.
by yakuzakitty April 19, 2009