(noun) A person who wait in ambush for stores to restock a sale item to buy in bulk and then turn around sell at an insane markup somewhere else.

Fake ass person who mooches off a person and offers an exciting, out of the ordinary, experience while projecting themselves as a cool person that should be talked about to everyone elses friends.

Someone who actively acts to steal the sympathy that is meant for someone else, generally by witnessing someone behave sympathetically to another and intersecting their own ( often exaggerated ) story of hardship so the sympathizer and the original beneficiary have to give the poacher all the attention and condolence. A behavior closely related to the chronic"one-upper" personality

Someone who is into underage persons

A man who date older women (Cougars).

A thought poacher consciously takes someone's thought and presents it as though it is their own. To poach a thought, one must be aware of its source when elocuting it.

The act of another sales person calling into your protected territory and secretly working deals.