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1.
The quality of having or being billowy, cloud-like, fluffy, or otherwise over-flowing. Often used to refer to ladies with big, squishy natural breasts that you wanna sink your face into
Im always on the search for billows that way i can rest my head without bringing around a bunch of pillows
av trixxy b damned 10 november 2006
 
2.
Play on the words "butt" and "pillow".
"Aw man this seat is uncomfortable. Can i have a billow?
av ILikePieSalad 21 september 2013
 
3.
When a woman farts whilst having anal sex.
Oh shit, bitch! Did you just billow? Now my one eyed viper's got pink eye.
av Matt McDouche 17 december 2008