A boobjob is when a woman, most likely with breasts of a considerable size, places the man's penis inbetween her breasts. She will then push them together and move them up and down.
Boobjobs are much more enjoyable when lubricated, they are often finished by the man ejaculating
on the woman's breasts, face or warn the woman first so that she may take it in the mouth
Sarah gave me a boobjob yesterday, I then came all over her chest.