Top definition
When you wake up, usually after travelling in a vehicle for an extended ammount of time with a rock hard member desperately searching for someone to touch it. Not to be confused with the travel fat where the person is fully awake during the fatting up.
Man I wish I wish had a crowbar to smash this muthafucken sleepy fat down!

Honey can you just touch it for a bit? I could could break a window with this!

(In a Taxi) Mahammed, can you tap my rock hard sleepy fat?
by Mr Tockley October 22, 2006
Get the mug
Get a Sleepy Fat mug for your bunkmate Sarah.