After sex or a blow job when a man takes a piss, the left over cum and piss is the cum quat.
After sex or a blow job piss in the other's mouth and feed he or she a cum quat!
meaning sperm resadue or is often used among american teenagers as an insult to call one another worthless or stupid.
aaron- hey you fucking cum quat give my pen back eric- what the fuck did you just say bitch. aaron-your nothing but a cum quat dude. will-fuck u man.