HIGH-lar-i-us (adj): A particularly clever yet unpretentious joke or situation which does not readily present itself as humorous absent higher intellectual processing. The rare occurrence where a British-style pun is actually quite funny. This definition, however, explicitly excludes esoteric, disciplinary humor such as that shared amongst PhD candidates, law-students and anyone remotely associated with the New Yorker.
1. It took me a while to realize that John Doe was actually highlarious.
2. "Everybody Loves Raymond" is neither highlarious, nor remotely funny for that matter. See: crimes against humanity.
Something that is only funny when you are stoned. Can also be substituted with highsterical. The more stoned you are the more highlarious things seem to be.
The movie, Liar, Liar wasn't that funny sober but it was highlarious after eating a pot brownie.