Yud is a general nickname which is commonly used for people with the name Yulander
A person: Hello yulander may i call you YUD
Yud is a term usually to deter ignorance, or general incompitance and insubordination, or just plain idiocy / something that you dislike
If you are yudded, you know you've done something wrong
goon #1 : hi wt u up2
You: I think the band ### is great, they provide a great selection of music, and the drummer cannot be beaten!
Goon #2: nop