When you toss and turn in your sleep and it gives you knots in the back of your head that fluff out
Person 1: Dude you must have slept like a rock. You should probably brush your hair you have a serious bird's nest going on in the back.
Person 2: Thanks man
A guy who has so much pubic hair that his penis looks small
Alex cut back on his birds nest before his big date so he would not look so small.
When you get jizz in your pubes and you leave it and let it dry into a bird's nest.
I ran out of tissues wanking so I had to make a bird's nest.
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The hair surrounding your butt-hole that when grown out completely can become tangled and resemble a birds nest.
I shaved my birds nest last night, it itches so bad.
A case of lack of lips on a person's face.
Man you have tiny lips. Like a Bird Beak.
Literally, to do drugs
Comes from the video "The Wierd World of LSD (1967)"
http://tinyurl.com/392flv
"Dude, do you want to fly a giant bird with me this weekend?"
"Hell yeah I do!"
"Man, we're gonna get so toked!"