Car handsfree device for cell phone used by turning on speakerphone and placing phone between cleavage in a lowcut shirt or by placing phone between seat belt and chest if cleavage is not a possibility.
OMG, i am so glad I had you on boobtooth, or that 5-0 would've busted me hard on the parkway!
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.