slutdar

Being able to detect a sloppy ho (slut) by the way they speak/act or any other characteristics.

Tina: U have a girlfriend?
Greg: Yeah
Tina: I bet she doesn't swallow your sticky load
Greg: No
Tim: Damn, my slutdar just went off.. Tina.. yous a nasty ho.

sick ass shit

Something that is way, way, way sick (awesome).

Rappers often use it to describe things.

Rapper: Yo, It's that sick ass shit.. don't fuck with it or you'll lose your grip. 99 tops spinnin on the ground.. a 44 mag to your head goes BLOWEN.
Other rapper: 99 tops spinning on the ground.. that's weak ass shit. (see weak ass shit)