A set of circumstances that might prevent an otherwise fun or enjoyable event. Also the sense of doubt or negativity one adds to an agreement.
We need to hang tonight, if weather permits.
If my girl says its cool, I'll totally come over tonight and play some COD!!
Bob: So we're all set to go to the club?
Steve: Hell yeah, its been so long since we've had time to kick it together!
Joe: Yeah, but we can't stay out too long man, I have to get up early tomorrow. Plus my girl doesn't want me staying out too long.
Bob: Man Joe, why you always gotta add a bitch clause to the situation??