pitch a tent

• pitch the tent

From the protruding and sometimes tent-like appearance of an erection through one's trousers or bedsheet.

• IPA^(key): /ˌpɪtʃəˈtɛnt/

• Audio (General Australian):

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pitch a tent (third-person singular simple present pitches a tent, present participle pitching a tent, simple past and past participle pitched a tent)

1. (slang, somewhat vulgar) To have an erection that shows through the trousers.
2. Used other than figuratively or idiomatically: to pitch a tent.