Shirt-hut
It's that nervous habit some people have when they stretch their shirt out over their knees. Usually results in one of your parents scolding you for stretching out the fabric
Zach: "Ryan! Stop making a shirt-hut! You'll damage the fabric!"
Ryan: "But I've got a big programming exam tomorrow and it's a nervous habit. Please don't get out the belt Zach!"
Ryan: "But I've got a big programming exam tomorrow and it's a nervous habit. Please don't get out the belt Zach!"