Top Definition
A milder term to say told you so or gutted.

May also be used as a form of rejection.
"You, WACKUP!"

OR

"You're totally wrong, therefore i suggest you wackup"
by Remi Mortimer June 25, 2008
1 more definition
5 Words related to Wackup
The word used by someone when a basketball swishes through tha net.
....... Wackup!
by Crunchy Black January 07, 2004

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