Top Definition
1. One who engages in sexual acts with another individual and who cannot remember doing such acts while no drugs are involved.

2. A hookup involving a person who is asleep while with another person but actively participating in the hookup.
When Jen woke up after hooking up with Jay, Jay realized she was a sleep fucker.
by Kyebosh October 25, 2005

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.