1)...to get completely wasted off a combination of drugs, such as acid, weed, and\or alcohol
2)...to be hit in the face by an object that causes spectators to laugh, and the person being blapped to feel very embarassed and stupid
1) Chang was so blapped last night, he killed someone. He's really going to regret dropping all that acid, then chugigng that whole bottle of vodka, what an idiot.
2) Hermes was so embarassed when Overton blapped him in the face with that squid, he started crying. What a fag.
Intoxicated with alcohol, occasionally used for other drugs like marijuana etc.
"I was so blapped at the party last night!"