Top definition
An old term in the Illinois State Refromatory to define a lie.

It is opposed to "bumping my head" which defined a homosexual act of bumping the head of your penis with the head of another penis.
"Man, don't bump my skull with that shit".

"That punk was bumping my skull when he said that".
by superyouper October 31, 2005
Get the mug
Get a bump my skull mug for your mom Sarah.