What is Happy Sauce?
Booze. An alcoholic beverage that makes you drunk, pissed, piss drunk, hammered, shit-faced, fucked-up, plastered, wasted, tipsy, loaded, blitzed, intoxicated, sloshed, tanked, flushed, blazed, trashed, intoxicated, inebriated, or trashed.
I think he's had a little too much happy sauce.
See booze, alcohol, sauce, drunk, liquor