dangle, n. — Green’s Dictionary of Slang

dangle n.

1. the penis.

[c.1886		Tilly Touchitt 13: Such a strange, long, lolloping dangle-dumdee].
1957		Kerouac On the Road 44: On the wall was a nude drawing of Dean, huge dangle and all.
1967–8		Baker et al. CUSS.
1977		S. Berkoff East in Decadence and Other Plays (1985) 60: Thought I tasted something very strange on his straining dangle.
1984		(ref. to WWI) Partridge DSUE (8th edn) 290/2: dangle-parade. A ‘short-arm’ inspection: NZ soldiers’: WWI.
1985		S. Berkoff West in Decadence and Other Plays (1985) 116: I’m channelled up the escalator still holding my dangle.
2001		Guardian G2 5 July 8: Of all the pleasures some may find in the male dangle, I venture that the view is not among them.

2. (US) an impotent man.

1975

J. Roe The Same Old Grind 201: ♣Who was you with? Some old dangle who can’t get it up?’.

dangle queen (n.) [-queen sfx (2)]

(US gay) one who wears clothes that deliberately emphasize the penis, or who exposes the genitals.

1972		B. Rodgers Queens’ Vernacular 60: dangle queen 1. gay exhibitionist. ‘Johnny was a dangle queen; he used to get busted for showing his schwantz to little old ladies in the vestibule.’ .. 2. man who wears tight trousers in order to show off his crotch contours.
1988		H. Max Gay (S)language 11: Dangle queen—gay who wears tight pants or exposes himself completely.

on the dangle (adj.)

(US campus) of the penis, flaccid; of a person, sexually unexcited.

1971