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1.
Adj. Something shockingly unfunny.

Antonym of highlarious
"Dude, that Heath Ledger joke you told was totally lowlarious.
by PrettyProblematic August 18, 2008
 
2.
The opposite of hilarious, but in a special way. When a friend is laughing at you, or you are the brunt of a joke, THEY think it's HI-LARIOUS but you, as the brunt of said joke, think the opposite - therefore to YOU, it's LowLarious.
Yeah, you think that's hilarious, don't ya? It's not - it's totally lowlarious.
by Kanji_Flufenoff April 09, 2011