He ain't make it in the leagues, so the streets wet him
Whether it be from getting in trouble (see Wale’s Varsity Blues.) or not enough talent, his little buddy didn’t make it big in sports, so he’s learning life from the streets.
Alternately, the lyric could be “He ain’t make it in the leagues, so the streets whet him”
Whet refers to exciting or stimulating someone — as in a street life excites the young man because it could offer an alternate out of his troubled life.
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