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Tresbag is a portmanteau originally formed, circa 2006, from "trespass" and "peakbag" (the noun or action of reaching the highest point of a mountain/peak/hill/etc.) but can be applied to any trespassing activity where an off-limits or private property objective is in mind, such as to bag a lake or to swim in a country club's pool in the middle of the night. If you get permission (from the landowner, government, et al) to do the "bagging" activity, then it's not technically a tresbag. Tresbag can be a noun or a verb.
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