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For example,
我廢了你
It can roughly translate to "I'll waste/break/ruin you", but that doesn't sound too accurate.
What "廢" sounds like is kindof like "crippling" yet less severe than that.
From what I can tell, it sounds like extreme, violent damage yet nothing as permanent as crippling.
废 is a slang, and as NS.X mentioned, "waste" is a pretty good translation, as in
I'mma waste you
Nonetheless, IMHO, 废 doesn't necessarily mean waste. Other meanings include:
"To destroy (life, job, etc)", as in
我废了你（的人生）
I'mma destroy your life
Changing the order makes more sense. 我废了你 = 我 make 你 废了。
I'll make you crap. Something like that. It just likes the ancient Chinese grammar.
How about I'll tear you (up).
废 means disable sb. here, so tear up may be an appropriate expression.
