An incredibly informal use of the terms such as : "incredibly good"/"well-liked"/"good".
Usually the word would be used in situations where two or more
people communicate to each other how they view their opinions on (a) certain intaty('
s), usually noun/
opinion/adjective, and even more usually used on forms of
food.
The word originates in slang culture in North
America, most likely having its roots in the word "busting", implying that the word originates from after one would
masturbate/ejactulate, after the sexual climax one would just had been finished "busting"; henceforth evolving in slag culture being used so commonly as a form of (in simplest terms) "good". Therefore, the word itself would grow into a New-England North American accent, evolving into the word "bussin"
(The word could also be used in a double conjoined sentence, where one's object/view would be *so* well liked, one would use the term "Bussin' Bussin'" to emphasize major forms of pleasure)