wall-banger, n. — Green’s Dictionary of Slang

wall-banger n.

[the effect of methaqualone is to slow and ‘soften’ one’s movements]

(US teen/drugs)

1. a Quaalude or methaqualone capsule.

1969		R.R. Lingeman Drugs from A to Z (1970).
1977		L. Young et al. Recreational Drugs.
1981		D.E. Miller Bk of Jargon 339: wall bangers: Methaqualone.

2. anyone who is so intoxicated by drugs that they cannot walk straight.

1981

A.V. Lloyd Drug Abuse.