No quit no spit refers to fellatio that is performed to completion, or orgasm, and includes the giver swallowing the reciever's ejaculate.
More About No Quit No Spit (NQNS)
The term no quit no spit may be employed in the context of sex work, specifically by an escort. The acronym NQNS can be used to indicate that they they offer the service. Likewise, a client may utilize it when inquiring as to whether the service is available.
