I'm the only thing hoppin' like a kangaroo
I mean the only thing poppin' like a can of brew

from Nicki Minaj – Itty Bitty Piggy Lyrics on Rap Genius

Meaning

(Nicki is raps IT girl right now)

‘Hoppin’ is used here to highlight the fact that she is the ‘only thing’ (female rapper) that is youthful compared to all the oldies. (lil kim, Remy, Foxy, Eve, Trina….)

Which would suggest she is capable of a lot more, than them.

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