Green’s Dictionary of Slang

swish v.2

[ety. unknown]

(N.Z. drugs) to distribute or sell drugs; esp. as swish on luckies v., to distribute or sell LSD or MDMA.

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[NZ]Eve. Post (Wellington) 16 Feb. 20: On a subsequent visit to Williams’ farm, Mr Hansen told him he had been swishing on luckies—distributing LSD or MDMA [DNZE].