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A fat, or "thick" person, most often in refrence to potential sexual attraction. Generally the derogitory label attributed to a person, or type of person, towards which someone is typically aroused by. Thickins are usually, but not exclusively, female.

Alternately spelled "thickun," espc. south of the Mason-Dixon line.
Holy crap she's a thickin.

Hold on, are you talking about the girl that sits next to you in computer class? You think she's hot? Jon...please tell me you're not into the thickins.
by xxcutyourhairxx May 04, 2006