Wordbond
Shortened version of "Word is bond" which is shortened version of "My word is my bond".

Meaning what you say is true and good.

However it can be used as a equivalent to saying "for real" or "are you serious".
Man 1: Yo man I tapped that ass last night
Man 2: Really?
Man 1: Wordbond

Dude 1: Hey man I almost hooked up with Jessica last night
Dude 2: Wordbond?
Dude 1: Yah man