Green’s Dictionary of Slang

oscar n.3

[from OOscar the grouch, in TV show Sesame Street, who lives in a garbage can]

(N.Z. prison) .

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 132/1: oscar n. [...] 2 a rubbish bin. [after Oscar the Grouch, a character from the US children's television programme Sesame Street, who lives in a rubbish bin.