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
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug