When a person just wants to ruin the mood with some mindless complaining over nothing particularly important.
Josh: Yo Todd man the Bears are starting to do real good this season!
Todd: Yeah man can't wait for the next game.
*Wild bitch appears
Cathy: Why don't women's sports get covered as much as men's?
Josh: C'mon Cathy don't act like a casual bitch right now.
by Da Cap'n Speaking November 27, 2014
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Whem somebody's normal face looks like they're pissed off and bitchy. Mostly women have it, Although a few cases have been found in men.
"Hey , Shelby looks pretty pissed off"

" nah dude, she's jus got a casual bitch face "
by youngsmiggle March 28, 2014
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