When one is about to ejaculate but completely confuses ejaculation with urination and thus creates a golden shower instead.
My boyfriend is a total imbecile! He totally mukmuk'd all over my new sheets when he mistook me for a urinal.

Doctor! You completely messed up when you were reattaching his vas deferens! Had I not caught this, he would have mukmuk'd all over somebody.
by Ziggy Volten February 11, 2010
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“Yo dude that dog is mukmuk
“who?”

“that’s michaels dog mugsie!”
by Michael Drotlegg August 25, 2022
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