Dopplebanger

Dopplebanger is a piece of internet-era gay slang, a play on "doppelganger" (a look-alike double) and "bang." It describes hooking up with or dating someone who closely resembles you in looks. The joke overlaps with the "boyfriend twins" meme, where couples appear almost interchangeable, and with the broader observation that people sometimes find their own features attractive in a partner. The word is used lightly and humorously rather than as a clinical or academic term, so its meaning shifts with the crowd using it. You will find it in memes, dating chatter, and casual conversation more than in dictionaries or reference works.