Green’s Dictionary of Slang

tent peg n.1

[the shape, but note the Biblical story of Jael and Sisera, i.e. the penis as a weapon (cf. axe n. (2))]

the penis.

1890
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1896
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[UK]Farmer & Henley Sl. and Its Analogues.
[UK]Farmer Vocabula Amatoria (1966) 101: Échalas, m. The penis; ‘the tent-peg.’.