A cumlicker is an individual either male or female who performs long or short sessions of oral or lots of hot sexy bang bang fuck y fucky with their partner. When the male ejaculates or explodes like a rocket the woman or man if the male is gay will lick it and slurp it like a lollipop. On a females side the male or female with lick all the juicy pussy goodness up like the apple filling out of a piece of poonani pie.
A woman who has sexual intercourse which concludes with ejaculation on her back side. Usually as a sign of disrespect and/or due to cosmetic defects on the front side of one's body (i.e. the face or breasts), cumbacker is often used as an ironic pun as the male will rarely come back once he is spent.
Sally knew she was a cumbacker when Johnny ejaculated onto her back and left without saying good-bye.