also: ガリセン
noun
person attracted to thin people
Slang term, often used in dating or personal preference contexts. ガリ refers to a skinny body type.
彼はガリ専だから、細い人がタイプらしい。
He's into skinny people, so it seems thin types are his thing.
Compound of ガリ (slang for skinny, from ガリガリ 'bony') and 専 (short for 専門 'specialist').