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1.
A combination of yer ma and orgasm. To give a female parent an orgasm. Note: this does not refer to your own parent specifically, it could be any female who is a parent.
Bob-"I gave a y'masm last night"
George- "Dude! That's my mum!"
by Theinfamousjim September 11, 2009

Words related to Y'masm

orgasm yer ma mum parent sex