|1.||chin backa head|
This is a style of blowjob whereby the woman kneels in front of the man and while she's performing fellatio he positions one hand under her chin, and the other hand on the back of her head thereby maximizing his control over both the rhythm and depth of her cock sucking.
This style is used in porn, and most frequently in the "slap happy" series.
Guy1: Did you get any last night?
Guy2: Yeah, got a little chin backa head from the missus!