look up any word, like cunt:
 
2.
BYD
"Back-yard Drunk"

When you wake up the next morning in your backyard with puke stains on your shirt, not knowing what the hell happened last night!
uhoh, it's Gus' birthday, HE'S GETTING BYD TONIGHT!
by jodayyy May 09, 2011
 
1.
byd
big yellow dick

When an Asian is surprisingly well hung.
Heather went out with Ichiro last night and she said he had a BYD. Wow that was not expected.
by Ichironimo September 05, 2013