(1) verb. The act of sucking or licking ejaculate (or other substances mixed with ejaculate) out of the orifice in which they were deposited. Most commonly used to refer to sucking out semen after anal sex, but technically sucking the semen out of your girlfriend's pussy is also felching

(2) Noun, referring to the substance ingested during the act of felching--generally a mixture of semen and other bodliy fluids (feces, sweat, vaginal fluid, etc.)

To orally extract semen from someone's rectum

To suck the semen, santorum, or other fluids out of an orifice after sexual intercourse. Not necessarily limited to sex with human beings.

to suck your own cum out of another persons ass.

Sucking, licking or eating your own jizz out of your partner anus after an intercourse.

The oral retrieval of semen from an anus or vagina

To suck out semen from an ass, or less commonly from a twat. Also known as the 'mud milkshake', and the 'sludge slider'