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Basically 'walashala' is slang word and is a combination of two other slang words 'wala', which means 'produce' and 'shala' means 'yourself'.

So altogather 'walashala' means ''Produce yourself''

produce yourself is taken in the manner that using yourself or implement your abilities in some productive way.
Alex:I am a loser tyler, what should i do?
tyler:just try to walashala.

Teacher:What is your hobby?
by Jhon fred January 13, 2012