'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
1. Attire
2. A person's outfit
3. Clothing, apparel
4. Cool clothes
Denise's "do-up" turned heads at the throw-down: black silk spray-on dress, no undies or bra. Oooooo-oo!
ay Gurl you tryna do up?
yo man this gurl last night was tryna do me up low key.
yo these gurls tryna run a train and do up.
When a person consistently says false facts and rubbish combined in a sentence
Richard: The apple is red and apples are found on
earth
Kevin: Nah apples are violet and I like to eat them on Mars *kevins moist laugh*** i am just doing up kev
Do something. Usually with purpose.
You wanna fight? Let's do it up bitch!