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1.
Toothin has many meanings.
It usually means chilling or relaxing.

This saying recently became popular on sites such as facebook. It is short for roostertooth. Also abriviated RT.

It's the new thing. Often used with a hashtag.
Hey whatsup?
Toothin', you?

#toothin
por no ! ram 15 de Novembro de 2011
 
2.
To use bluetooth technology with a cell phone
Look an Nate; He is toothin'!
por Matthew Demarest 03 de Agosto de 2006