'哥们儿' (gē men r) is a warm, informal term for a male friend—similar to 'buddy,' 'pal,' or 'dude' in English. It combines 哥 (gē), meaning 'older brother,' with 们 (men), the plural marker, and the retroflex suffix 儿 (ér), which adds colloquial, Beijing-influenced flavor. Though literally 'older brothers,' it’s rarely used for actual siblings; instead, it signals camaraderie, trust, and relaxed familiarity among peers, especially young or middle-aged men.

The term carries masculine connotations and is seldom used by or toward women (though occasionally adopted playfully in very close mixed-gender friendships). It’s common in spoken Mandarin, particularly in northern China, and appears frequently in casual conversation, TV dramas, and social media. Unlike formal terms like 朋友 (péng you), '哥们儿' implies shared experiences, mutual support, and a lack of pretense—it’s the word you’d use when inviting someone to grab a beer or help move furniture.