Etymology

piss proud

Today it means: Having an erection when waking from sleep or, more generally or metaphorically, a false or "empty" erection. Full definition →

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The story

From piss (“urine”) + proud. Appears in Francis Grose’s A Classical Dictionary of the Vulgar Tongue (1796): : “PISS-PROUD. Having a false erection. That old fellow thought he had an erection, but his — was only piss-proud; said of any old fellow who marries a young wife”.

Etymology from Wiktionary, CC BY-SA 4.0.