Unlike casual sex, this is the converse. Casual head is the equivalent of a bro asking for head done in casual setting (like a library, stacks or the ugli for #umich students).
Bro 1:Hey bro, I got casual head from the bae Kelsey!

Bro 2: No way! Casual head? That's so…causal.
by Sex in the Stacks February 6, 2014
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