to get overly excited about someone else doing something well.
if a boy is hyping up his girl he is being extra excited about how good she looks or how great she is.
boy: oh my god babe you look so good in that picture damn my girl is the hottest

girl: aw look friends my cute ass bf is hyping me up!

scenario 2:
girl: ya whatever i like your new shoes

boy: girl wyd hype me up sometimes JEEZ
by @hypegirl June 4, 2017