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'Doing up' means to to something to its full extent. Normally something one wouldn't regularly do.
Example being, a person is baby-sitting their niece/ nephew and but is asked to come out with friends:

Person 1: Yooo come through this party tonight man'

Person 2: Ahh I can't man, I'm doing up uncle duties and shitt
by Kerra1995 June 13, 2018
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