My size! 

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*.'
'MY SIZE!'
'Yea, you feel proud of yourself, fuckboy?'

My size! by Daddy 8======D November 4, 2018

My Size 

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

My Size by ldndon March 23, 2008

Oi Mysize 

Adam Deacon (A Peng Boy From Adulthood And Kidulthood) Uses This Word Meaning Gash ,Girl Wifey And That Shit.

Cam;Oi mysize
Kad; (ignores Cam)
Cam;Oi girl im talkin to man
Cam; Oi im chattin to yuu

Oi Mysize by KADiiSHA BRuuVV January 10, 2009

Mysize 

a word meaning girl, gash, wifey in slang terms, heard in adam deacons adamhood song and the 2006 hit film kidulthood.

"oi mysize, OI GIRL IM TALKING TO YOU"
"oiiii she is peng hot chung mysize"

Mysize by bakezyyy August 4, 2008