asstamina is your butts overall endurance; like how long you can ride a bike, sit in an uncomfortable chair, or be fucked in the ass without it starting to hurt.
#1: matt "my ass hurts so bad from riding my bike"

tiffany "well you just need to increase your asstamina"
matt "yea yea, i know"

#2 kaleb"man i wish that girl would last longer as i ass-fucked her.."
sam" yea, girls these days just dont have enough asstamina"
by sillyblondegirl April 25, 2010

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