1. When an assumption is tasty and delicious and you can't get enough of it.
2. When a person seems sexier due to your precognitions/biases of them.
To many people, the assumption that God exists can make religion very asscrumptionous as it's very reassuring and satisfying to imagine an omnipresent God who loves you and cares for you.
I wonder if that blonde chick is a hot dumb lesbian. Imagining a threesome between us and her friend makes her all the more asscrumptionous.
The ability girls and women have developed to hold several items at once in one hand. The skill has been developed due to the lack of pockets in women's clothing.
I thought she'd need multiple trips to carry her phone, keys, wallet, and Starbucks to her car since she needed the other hand to open the door, but she used her impressive girl grip to carry everything in one hand.