also: ゆびまん
noun
finger-banging
Vulgar slang for manual stimulation of female genitals. Compare 手マン, which may imply a broader hand-based technique.
See also: 手マン
彼は彼女に指マンをした。
He finger-banged her.
Compound of 指 (yubi, 'finger') and マン (man), a slang abbreviation of マンコ (manko, 'vagina').