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
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Practicing the art of laziness of the body and mind.
Tell Lonnie to stop horse toothin’ around!! He’s always late!
Speaking on your bluetooth while using the bathroom
man 1: hello!
man 2: what up B?
man 1: hold on im toothin in the can!
man 3: who are u talking to?