warm homosexual 3 realizations
ACCEPTED Realization 1
Type Derivation
Language German
Lexeme 1 schwül
Lexeme 2 schwul
Meaning 1 warm, stuffy
Direction
Meaning 2 gay, homosexual
Reference DWDS
Comment In colloquial speech, the umlautless form schwul takes on the meaning 'homosexual' (c. 1900) 
ACCEPTED Realization 2
Type Derivation
Language German
Lexeme 1 warm
Lexeme 2 warmer Bruder
Meaning 1 warm
Direction
Meaning 2 (obsolete, slang) homosexual
Reference DWDS
Comment Robert Beachy (2014) Gay Berlin, Knopf Doubleday: “As early as 1782 one guidebook devoted a short chapter to Berlin's “warm brothers” and the prevalence of male prostitution as an income source for garrisoned soldiers.
ACCEPTED Realization 3
Type Polysemy
Language Hungarian
Lexeme meleg
Meaning 1 warm meleg víz
warm water
Direction
Meaning 2 homosexual meleg nő
lesbian (lit. homosexual woman)
Reference MEK 1978
Comment Possibly, the Hungarian expression has been calqued from German.