Klock's definitions
traditionally, in the hip hop cultural world, the word "up" succeeds the word "word". this combonation, of what seems like two unrelated words, actually is a form of acknowledgement, or apporoval. Some synonyms inculde, "I concur." and "Yes, i agree with that"
"Gee George, your lawn looks very nice today"
"Word up"
"Oh wow, Mary, you really knew what you were doing when you decorated the great hall"
"Word up"
"Word up"
"Oh wow, Mary, you really knew what you were doing when you decorated the great hall"
"Word up"
by Klock October 8, 2006
Get the word upmug. 
Get the Hippopotomontrosesquippedaliophobiamug.