Define Your Forehead Meaning

1) When a negative aspect happens in ones life
2) sucks for you.

A phrase instructing the subject to rest his/her forehead on a specified object (such as a table) so that the subject is bent over and easily accessible for doggy-style sexual intercourse.

This phrase is used while slapping the object that the forehead should be placed on with your fingertips, similar to the way the phrase "knock on wood" requires knocking a table.

when you're walking down the hall and a boy comes up to you looking for a good time. and he goes "hey, what would you do if i just put my nuts on your forehead?" and you say "then i'd put MY nuts on YOUR forehead" is accepting invitation to go smoke some pot while listening to peters techno...
this only works if you're a girl.

A friendly farewell amongst headbangers, similar to "have a great day" or "Live long and prosper".

It stems from the concept that if a male were to "bang" (i.e. have sexual intercourse with) someone's head, their balls would be on the person's forehead.

jail term, to hoop is to smuggle drugs or parphenelia into a jail. hoop your forehead is to suggest you smuggle your own head up your ass.

When someone doesn't understand a joke, misses a joke or appears to laugh too long after a joke has been made.

The longest thing in the whole Entire planet