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A girl that meets all the right criteria. Basically your type of girl, as in she ticks all the right boxes.

So in essence she is fit for you, or your size.

Usually used when trying to catch a girl's attention, best used by shouting at them, to get full effect.

Made famous in the film Kidulthood by Jay (played by Adam Deacon)
"E-YO MY SIZE!!! MY SIZE!!!" shouting at a female
by ldndon March 23, 2008
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a word meaning girl, gash, wifey in slang terms, heard in adam deacons adamhood song and the 2006 hit film kidulthood.
"oiiii she is peng hot chung mysize"
by bakezyyy July 10, 2008
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This is the type of prank you pull on someone while they're yawning. When you see someone yawning, you yell out 'My size!', meaning that the size of your dick takes that much space.
'Oh man, I'm pretty tired.
'Yea man, so am I. *yawns*.'
'Yea, you feel proud of yourself, fuckboy?'
by Daddy 8======D November 04, 2018
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