![1boy :d astolfo_(fate) bangs black_bow black_shorts blush bow braid chinese_commentary collarbone commentary_request cross-laced_footwear fang fate/apocrypha fate_(series) full_body green_background groin gym_shirt gym_shorts hair_bow hair_intakes hand_on_own_cheek hand_up highres holding kneehighs leiq long_hair looking_at_viewer male_focus multicolored_hair navel open_mouth otoko_no_ko parted_bangs pink_eyes pink_hair racket red_shirt shirt shoes short_sleeves shorts signature simple_background single_braid smile sneakers solo standing standing_on_one_leg stomach streaked_hair t-shirt tennis_racket two-tone_hair upshirt very_long_hair white_hair white_legwear yellow_footwear rating:s score:2 post #3056032](/cdn_image/preview/d3/c5/d3c5c74711754c08884315f5a6faa335.jpg)
男の娘 (otoko no ko) is a Japanese slang term used to refer to persons of male biological sex who have taken on the appearance and/or identity of the female gender. The term is a pun on 男の子 (otoko no ko), meaning "boy", replacing 子 with the ko reading of 娘 (commonly musume, girl).
Some communities have mistakenly taken to using the term as a word for feminine boys no matter if they convincingly wear girl's clothing or not. If you can correctly tell the gender with complete certainty from the thumbnail alone without looking at the genitalia, it's not this.
English-speaking fandom has traditionally used the word "trap" for this concept. Due to the negative implications of the term and its history (which 男の娘 largely does not share) as well as the term's ambiguity in English, its use is inappropriate for tagging purposes and it has been aliased.
On Pixiv the tag 男体化 is sometimes used for genderswap or otoko no ko art, but its meaning- "male's body", has multiple definitions. It can be a crossdresser who has a more masculine body (but isn't obviously a man), a woman who is very muscular, or it is sometimes used in place of otoko no ko (i.e. "he may have hips, but that's a boy's body").
The following tags are aliased to this tag: femboy and trap (learn more).