An extremely comfortable shirt given to a “significant other” who spent the night and needs a spare change of clothes to look stylish on their walkhome
Sorry you have to spend the morning in your top from last night, I’m out of shackershirts :(
something a shacker (usually female) will take home after spending the night at someone's place such as a t-shirt, usually something of very little value
Friend 1: Dude did you have a shacker last night
Friend 2: Yeah man and she took home a shacker prise, one of my favorite t-shirts