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1.
A piece of clothing that wraps around the waist hiding the ass most popular forms of Ass Aprons are sweaters or long sleeve shirts
I was walking in the mall and this gorgeous girl was coming my way, when she walked by me I looked back to get a look at her ass but she had it covered with her ass apron
by NickyLags July 30, 2010
 
2.
A term that a baseball umpire uses when a ball player argues the call with them in a very ignorant manner.
Player - "That was a shit call!"
Umpire- "Youre an ass apron!"
by AA-ron Wood April 24, 2013