A person who is nice but sometimes nuts. Also hates moving around. Basically, a couch potato who is nuts.
Guy A: I like girls but I don't want to marry anyone.
Guy B: You're a potastic.
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Too many potatoes in an allocated space (eg. sack); A potato- disaster.
Tom's basement was a potaster, with potatoes occupying every corner of the room. His mother would not be happy about this.