Buzz Weak
The inability to remain active at a party or social gathering due to the ingestion of excessive intoxicants, usually referring to illegal narcotics.
"Hey guys, what's wrong with Mark? He's mumbling to himself with his eyes closed."
"Oh, don't worry about him, he's had a bit too much (insert narcotic here). He's always buzz weak."
"Oh, don't worry about him, he's had a bit too much (insert narcotic here). He's always buzz weak."