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after a heavy session of masturbation, the residue that may or may not get dried onto your stomache, sometimes referred to as "flab", or the fat on your stomache.
"Dude, what's that on your stomache?"

"I jacked off last night..."

"It must be flab jizz!"
by hjklhjhjkl October 28, 2009

Words related to flab jizz

belly fat heavy masturbation sperm