open Bolt Semi, this is a type of gun that was ruled an illegal machine gun by the ATF in 1982. It was decided that they were to easy to convert to full-auto.
by Alex Lindsay March 28, 2008
Prefix meaning "obligatory". Most commonly used when saying something otherwise offtopic in places like Slashdot where that is frowned upon. Can be used where something is expected but might otherwise be missing.
Jessica Simpson is an airhead.
ObTopic: Linux is cool.
ObDrama: But she said she liked him instead.
ObLanguagePolice: There is no such word as "alot".
ObTopic: Linux is cool.
ObDrama: But she said she liked him instead.
ObLanguagePolice: There is no such word as "alot".
by fax4voice3 December 1, 2005
Stands for Optimal Breast Size. OBS is the point at which the female chest is near perfect in dimensions; they are neither too small or too large, as Goldy Locks would put it, they're juuust right.
by David James Saniti February 28, 2008
"Old Balls" usually used to make fun of someone because of their age, or on their birthday to make them feel old.
by pobcat March 22, 2010
Older Boy. similar to Older girl or Little boy. if you are a girl and you are going out with and older boy OB.
by pooismylife May 18, 2011
by greg bush June 14, 2008