When an individual gets so drunk that they pass out and miss the best part of the night e.g. missing a band play/ a fight/ something else epic that will be talked about for years.
"Yo man, did you see Tony last night? Dude was fetus drunk and passed out at 10 and missed out on that 20 person orgy"

"Yeah, I seent him, what dumbass"
by Cletus_L_Windjammer January 11, 2014
Get the Fetus Drunk mug.