balls-deep adverb2 •(slang, vulgar) With the penis fully immersed in an orifice, more often the anus or vagina than the mouth.I like to fuck balls-deep. If they can't take it all it's not worth the time. •(vulgar, figurative) Synonym of neckdeep (“fully immersed or committed (to something)”)I'm balls-deep into this essay; there's no turning back.
