1) When someone kisses another person unexpectedly such that they didn't know it was coming or if they wanted it (Not applicable for couples)
2) When someone kisses another person and the other person doesn't like the other or doesn't want the kisses.
1) So we were just hanging out and then there was a little bit of lip rape... he didn't see it coming but he definitely wanted it!
2) Ew ew ew that weird guy just lip raped me!!!