そそり勃たつ

godan verb (-tsu), intransitive verb

become erect; tower like an erection

Vulgar pun on そそり立つ (to tower, rise up), using 勃つ (to get an erection). Used for penises, nipples, or things that stand up suggestively.

See also: そそり立つ (そそりたつ)

• 彼かれの股こ間かんがそそり勃たっているのが見みえた。

  I could see his crotch was erect.

• その塔とうはまるでそそり勃たつかのようにそびえていた。

  The tower stood tall as if it were an erection.