glass, adj. — Green’s Dictionary of Slang

glass adj.

(US, orig. boxing) used of any weak or vulnerable part of the body, e.g. a glass chin or glass jaw n. (1)

1917		implied in glass jaw n. (1)
1921		R. Lardner ‘A Frame-Up’ in Coll. Short Stories (1941) 425: He hit Porter just once and broke his jaw. And Charley’s jaw ain’t glass, neither.
1971		T. Thackrey Thief 61: He had a glass gut from drinking too much.

glass dick (n.) [fig. use of dick n.¹ (5)]

(drugs) a pipe for smoking crack cocaine.

1991		Cooper & Wright New Jack City [film script] People sit down and light that glass dick and take a hit.
1995		J. Stahl Permanent Midnight 251: A clean syringe turned out to be a pipe. Instead of a rig they’d slipped me the glass dick.
2005		G. Pelecanos Drama City 25: Sittin’ around with a bunch of fiends, suckin’ on that glass dick.

glass gun (n.) [early syringes were made of glass; they gave one a shot n.¹ (6b)]

(drugs) a hypodermic needle.

1949		Monteleone Criminal Sl. (rev. edn).
1953		Anslinger & Tompkins Traffic In Narcotics 309: glass gun. A hypodermic needle.
2001		ONDCP Street Terms 10: Glass gun — Hypodermic needle.

glass eyes (n.)

see separate entries.

Glass House (n.)

see separate entry.

glasshouse (n.)

see separate entry.

glass jaw (n.)

see separate entry.

glass legs (n.)