What does Backwards bird feeding mean?

Backwards bird feeding meaning in Urban Dictionary

whenever a man cums in a girls mouth and she acts like she actually is swallowed it and goes in for a kiss. During this she'll spit the semen in to the men mouth (like a bird feeds it's younger) pushing him to taste his very own cum. When he realizes it's their own sperm he can gag and throw up although the girl laughs.