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1.
bttb = baked to the bone

Under the influence of high quality marijuana... high as fuck on good shit. Typically used when texting while baked because it's easy to type.
Dude I'm bttb!
by _The_Dude_ December 19, 2009
 
2.
Better Than The Brochure: Exceeds expectations! Pronounced "B Double-T B".
This haunted house scared the fucking shit out of me - it was way BttB!
by Jack Take It 2 The Rack July 08, 2014
 
3.
bad to the bone
I heard he stole the history final, he's so bttb!
by k-dizzledogg June 11, 2009
 
4.
Back to the basics

Back to the base
The student failed the advanced course, so he had to go bttb.

The soldiers were losing, so they decided to go bttb.
by Solar_Falcon October 09, 2010