To let the birds out on someone is an action which signifies that what the person has just done or said was a huge wreck. It is done by crossing your arms and linking your hands at the thumbs, flapping the remaining fingers like a birds wings. The action is to be accompanied by the sound: "hmmmmmm", as well as erratic flapping and head-bobbing to your desire.
Letting The Birds Out can also be conducted in a partnership, or a large group, all simultaneously letting the birds out on one persons morale.
"Isaak that was a shit joke, i'm gonna let the birds out"
Isaak: "(insert lame joke)
Dave & Rusty: "hmmmm hmmmm" (Letting The Birds Out)
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When a big assed girl (especially those named Susan) lets their fucking rangoon filled tits out for all to see. Done especially in swimming pools and at nude beaches.
Man: Oh fuck! Is she really gonna do it?!
Other man: She’s really gonna fucking do it! She’s letting the birds out!
Susan: Hey boys, want some rangoon loaded fuckers!?