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an insult the cockney equivelent of a twat.
from the mighty boosh:
vince noir:"he's melted"
The Hitcher:"i ain't meltrd you ONION im over 'ere!

me: (aside) nice one boosh
onion by eoghan the great June 26, 2007
$250,000. a large sum of money
YB: Can you believe it? My dude done sold 12,500 units@ $20 a piece.

TXS: Yeahhh Buddy, thats an onion in the pocket.
Onion by YB The Rock Star May 14, 2010
To be absolutely silent as an onion is.
Mason: “Yeah, you’re the expert in quiet.”

Woods: “I’m a goddamn onion Mason, you should know that.”
Onion by Swatboy0915 January 8, 2021
Something that is perfect for you. An act or item that you love or are really good at.
Willo, That chick is your absolute onion!

Thats my onion
onion by ziley December 6, 2006
term that refers to a hott piece of ass of any age who makes an appearance at fast food restaurants; always of the female persuasion.
dude 1: "man, did you see that onion?"
dude 2: "was she a blooming onion?"
onion by inlovewithlaugh January 16, 2011