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1.
Woi
A word used when one has a great feeling of awe. Can be used in many situations, good or bad.

Used when something unexpected or when something extraordinary or even something remotely interesting, happens.
1) Did you check out that girl, Woi, she was fit i tell ya

2) Woi, check out all the mandems, you get me BO

3) Woi that film was damn good
by Ngunjiri September 10, 2007
 
2.
Woi
An expression of happiness
If something funny or good happened, one can shout 'WOI'
I banged that gash, WOI
WOI, mental day off tomorrow
by Woimaster November 17, 2011