(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 orally extract semen from someone's anus. Sometimes a straw is used for this purpose.

When some one cums up a persons ass then sucks it out

When a man cums in a womens anus or vagina then sucks the sperm out with his mouth.

the art of sucking delivered semen out of orifices!

Sucking the sperm or semen out of a lucky persons asshole right after youve made anal thrusts to their ass.