Top definition
A Uiif is a person who was in a spamming/hacking group and hade quit all the spamming and hacking and even the group they where in.

Uiif's are very skilled spamming/hacking people and you do not want to be friends with.
Yo did you hear about that about that uiif that hacked that website!?
Get the mug
Get a uiif mug for your Aunt Jovana.
buy the domain for your travel blog