the sperm donor (could be a one night stand, man whore, or a fuckboy) of a woman's baby. he dispenses seed just like a birdfeeder.
Sarah changed Daves contact info to "birdfeeder" because all he is good for is dispensing seed. Johns friends started to call him "birdfeeder" because of how many women he's knocked up.
When a woman is on her back and the man is face fucking her whilst she is begging for it, like it's food and she's starving (much like a mother bird feeds her chicks). The man proceeds to tease the woman by pulling it out and letting her get some nibbles.
Oh shit Charlie was giving some girl the birdfeeder again last night. She was hungry too!
When you've done too much meth and your teeth fall out, so you have to get your partner to spit chewed food into your mouth. Also can be used as form of foreplay.
"Yeah girl, I ain't got no teeth so I need you to come over here and give me a Bolivian Birdfeeder, then we can get freaky."
When a man ejaculates into a female's mouth, and then the female proceeds to pull trig, vomiting both her stomach bile and the man's semen back into the man's mouth.
Handsome Stud: "Yo dog I was piping this hooker last night and decided to finish things off with a nice little South Carolina Birdfeeder."
Stud's Friend: "No way dude I did the same thing last week to some random chick I met at a frat party."