Back door love can mean two things: anal sex, which "back door" can be your anus. It can also be a lover (male/female) of a married man/woman.
"I'm your back door lover/ creepin' in when the lights go off..." Song lyric from Josie and the Pussycats (movie)
1.)A gay man
2.)A straight man OBSESSED with anal sex
3.)A man who loves back doors
1.)"Look at that back door lover and his little poodle. Poof."
2.)"I'm what you call a back door lover. If it's not brown, i'm not down."
3.)"He seemed like a nice guy until he saw my back door...then he changed completely"
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