Top Definition
Sum Gai Goo ~ much like the popular cream of Sum Yung Gai it's another fake take on word for semen. Man Juice. Cum. You get it.
"Hey bro, have you seen Derek?"

"He's been hiding in his room with his new GF.. From the moans I unwillingly heard, seem like she's whipping a batch of Sum Gai Goo."

"Good for him, he's been an uptight ass lately."

"Maybe this will mellow him out a bit"
by TheLoneStranger November 15, 2013

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