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1.
when a girl is so down to get with you
used in usual bro chat
bro 1: yo i was wheeling that hoe last weekend eh?

Bro 2: Brooooo you're so in
by BrOoOOooOOoOOOooooooo128746378 March 04, 2010
 
2.
Exclamatory phrase which can be heard in the ghetto's of central London.
Originally used to portray joy, it is now often used in a derogatory context.

Source: Mcfly3004, London
asbo1: Ive just landed a job at McDonalds!
asbo2: Soin!, well done mate
or
asbo1: You smell like bum
asbo2: Sod off soin boy
by Mcfly3004 August 17, 2006
 
3.
Exclamatory phrase which can be heard in the ghetto's of central London.
Originally used to portray joy, it is now often used in a derogatory context.
asbo1: Ive just landed a job at McDonalds!
asbo2: Soin!, well done mate
or
asbo1: You smell like bum
asbo2: Sod off soin boy
by Mcfly3004 August 16, 2006