Young thug, bashful about bungled bosh (4,3)

I believe the answer is:

cosh boy

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'young thug' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'bashful about bungled bosh' is the wordplay.
'bashful' becomes 'coy' (I've seen this in another clue).
'about' means one lot of letters goes inside another.
'bungled' indicates anagramming the letters.
'bosh' with letters rearranged gives 'shbo'.
'coy' going around 'shbo' is 'COSH BOY'.

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