This is an expression guys use to detemine if a
girl is interested in you or if you are already drilling her? It can also be used as an expression for a hot piece of ass that
one would like to
nail.
Mike: Hey
Joe, I saw you talking to Mary earlier today. Is she on tip?
Joe. Not yet, but I'm working on it.
As
Joe and Mike are talikng, a gorgeous slut walks by. Mike says, "on tip!", then Joe says " i'd love to crush that pussy!"