A shortened version of "awk for you". When someone says or does something awkward, someone else might say "awk for you!" which online translates to "awk4u".
Emma (runs up to some random girl): hey dude kelly!!! whatssuppp?
Random girl: umm excuse me, do i know you?
Emma: ...
Owen: awk4u!
Random girl: umm excuse me, do i know you?
Emma: ...
Owen: awk4u!
