A lesbian term used to pick up on young, strait or possibly bi women. Women whom usually use this term are older women, normally picking up on young-teenage girl.
Mainly used at concert settings.
It means to perform in lesbian sex, for it is similar to two "walls" slamming into one another.
When a male attmepts to fellate himself however the extreme angles involved cause him to throw his back out, and he is stuck in that position until help can arrive.
Hey, Steve got caught in a Toledo Jackknife, again.