I got big plans, yeah I feel myself hard like both hands
Yeah, I feel myself hard like both hands

from Childish Gambino – Both Hands Lyrics on Rap Genius

Two lines, same words, different meanings.

In the first line, he means he has big plans and he’s confident in himself, he feels (likes) himself hard(a lot) like both hands, referencing jacking off.

In the second line, he references the name of this song, saying he really likes it (and implies that other people will be feeling it too).

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