balls deep

副词 adv.
中文释义

英文释义

副词 adv.
  1. Extremely; to the fullest extent possible. not-comparable,slang,vulgar
    — Although he was hesitant to pick up James Joyce, he soon fell in love with Dubliners and was balls deep into Ulysses.

词源

From the testicles hindering any further penetration in a sex act.
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