The act of cumming in your cupped hand and then lightly slapping your partner in order to splatter jizz over her face. An original move of Muscat Private School, Oman gentlemen. Usually performed when she tells you to NOT cum on her face.
"Cumshaw": In the Coast Guard, at least (this may be an incident of perpetual under-funding), the commonest definition of "cumshaw" verb is pretty much identical to your first definition of "scrounge" verb. To cumshaw is to get by irregular means--exchanging favors, calling in debts, cutting corners with procurement--what an individual Coastie, a group, a cutter, or the like should be able to get by regular ones.