Knowingly keeping a third parties
item/belongings once its rightful owner is found. More or less indirectly
stealing something. To Ekaiser someone is to not relinquish previously unclaimed goods once the rightful owner has come forward.
Guy 1: Hey I know I gave you that Armani blazer that was left at my
house after the party, but I found out it was
Jimmy's brothers coat after all and he wants it back
Guy 2: Yeah well you did give it to me, tough luck pal you're not getting it back
Guy 1: You're a
fucking grease-ball, way to Ekaiser his brother man