Small patch of hair just below the lower lip. It's called a bum tickler because it tickles a chicks bum when performing cunnilingus.

A person with an outwardly dominant, masculine, or aggressive personality, but who also enthusiastically takes on the submissive or "bottom" role in the bedroom.

A large erected penis. A male or female rubs it on the anus and it sends a shock through the rectum. This experience is worth while

Abnormally long toe hairs. So long in fact that when placed on someones backside they tickle.