Rogie... I've learned more interesting and bizarre words from you. Where and how did you even learn what this word meant? First hand experience?
Urban Dictionary... various definitions. Of the three given options... #3 would probably be acceptable.
1. Felching
The act of sucking semen from any human orafice, eg. anus, vagina, it can be done with a drinking straw when semen is deep inside the rectum.
2. Felching
To blow your hot, creamy load into your partner's anal orafice, then removing the aforementioned cream with your mouth, only to make out with your partner.
3. Felching
To insert your wrinkled tally wacker into a woman's orafice, preferably not in the nostril, and unloading your succulent love juice only then to remove the creamy delight from the orafice and spreading the salty sensation between two bagels.