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See also: balls-deep
The phrase is derived from a state during the act of copulation in which further penetration by the male is prevented by the physical limitations of the testicles, which reflects the fullest extent to which the action may occur.
- (vulgar, slang) extremely; to the fullest extent possible
- Although he was hesitant to pick up James Joyce, he soon fell in love with Dubliners and was balls deep into Ulysses