NSB

Non Spec Bitch.
A DRSL spec drone that does not meet the 1280g requirement.

Us: Yo are you an NSB today?
Them: No. I added lead weights so I'm at 1285g now.

NSB

A DRSL spec or Practice Rig frame that does not meet the 1280g weight requirement to race.

Us: Yo, you ready to race today?
Them: Nah fam, I'm a NSB... not even worth racing.