We found one dictionary that defines the word wring out one's sock:

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1. wring out one's sock: Wiktionary

Definitions from Wiktionary (wring out one's sock) ▸ verb:  (vulgar, slang) Of a man: to urinate. ▸ Words similar to wring out one's sock ▸ Usage examples for wring out one's sock ▸ Idioms related to wring out one's sock ▸ Wikipedia articles (New!) ▸ Words that often appear near wring out one's sock ▸ Rhymes of wring out one's sock ▸ Invented words related to wring out one's sock