Mennonite necklace
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A Mennonite Necklace is the accumulation of perspiration that [gathers] around the [collar] of a t-shirt. It is important to note that a proper Mennonite Necklace is distinguished by the fact that the shirt has no other [sweat stains] apart from the collar area.
Mennonite necklace meaning & definition 1 of Mennonite necklace.