Top Definition
Acronym for "beat you the fuck up"

Only said when chatting on the internet, since if you said "B-Y-T-F-U" in person youd probably get beat the fuck up.
In caht room
XJohnyX: Hey dude, i slept with ur mom last night
Nerdwhosequeer: thats suptomically incorrect due to the stars positioning and the graphic displacement of the sun in duirect alignment of the moon
UncleJessie: hey f*cking nerd!if you dont stop talking like a nerd, I'll bytfu!!
by Mike February 08, 2004
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