1) To fight or argue with someone.
2) A video game based in the future, where you live in 'Vaults' and you try to escape to the polluted world outside (nuclear bomb war)
1) Jenny: I wish you'd shut up! *pushes*
Carl: *slaps*
Jenny: I'm going to fall out with you.
2) Ryan: Hey, have you seen that new video game Fallout 3? It's awesome dude.
of military origin esp. U.S. Army...
1. to break ranks
2. to step out of formation
3. to be left behind because your fat ass cant keep up
4. to anounce ones exit
5. to quit drinking. vomit, or pass-out
private partz fall out
im gonna fall-out
dont fall out you fat fuck or im gonna PT you to death!
Jones fell out and puked all over the cab
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!