Green’s Dictionary of Slang

helmet n.

1. (also copper’s helmet) the glans penis.

[UK]S. Berkoff East in Decadence and Other Plays (1985) 71: Leather-loin boys with long records of glorious GBH tattooed on the helmets of their cocks.
[UK]A. Bleasdale Who’s Been Sleeping in my Bed 69: She [...] grabbed me nudger through me trousers an’ squeezed me copper’s helmet.
[UK]A. Hollinghurst Swimming-Pool Library (1998) 156: I grinned at his fidelity, his cleanness, the plump relief of his ... copper’s helmet.
[UK]M. Amis London Fields 83: Marmaduke, while feigning babyish absorption in the flush handle, had once smacked the seat down on him with incredible suddenness and force, dealing Guy a glancing blow that had none the less empurpled his helmet for a month and a half.
[UK]I. Welsh Trainspotting 219: Ma cock also smells pretty foul and flecks of knob cheese are visible oan the helmet.
‘UK Snowy’ ‘Christmas Blackmail’ at www.asstr.org [Internet] I [...] felt maybe half an inch of my helmet ease into her hot tightness.
[UK](con. 1980s) I. Welsh Skagboys 84: You are one housebound, helmet-sucking, hamster-chopped harridan.

2. a haircut.

[US]P. Hamill Dirty Laundry 106: Her helmet of tangerine hair was twisted and mussed.
Online Sl. Dict. [Internet] helmet n 1. a haircut or hair style. Usually used derogatorily. (‘Look, she got a new helmet.’).

3. (US black teen) a condom.

‘The Helmet Law Page’ at www.ncrider.com [Internet] If the social nannies do not want to mandate ‘helmets’ (condoms) for people, why do they insist on helmets for our riding lifestyle?
www.Amazon.com [Internet] [blurb] Use your head...wear a Helmet! Be sure to holster your weapon properly with Joe Lube Helmets. Available in boxes of 3 premium lubricated latex condoms, or as singles in a bag of 12.

4. from a male perspective, a woman.

[US]J. Doyle College Sl. Dict. [Internet] helmet [Penn State] women.

5. (US campus) a man.

[US]Eble Campus Sl. Apr. 3: helmet – male. ‘Too many helmets, not enough bettys here’.

In phrases