Combination of Plastic and tan.

When someone obsessively tans their skin so much, they start to look fake like a burnt, plastic barbie doll

Plex-e-tan is an adjective used to describe skin that is often burnt orange, or extremely dark tan and leathery or extremely shiny from over oily.
Snookie has rocked the plexitan look.
by Fae Mousse Mandi October 14, 2011
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