Carelessly yanking the overlapping laces of a shoe loose to ruin the function and appearance of the weave.
This causes the targeted person to have to painstakingly re-lace the potentially damaged shoe, hence the word "rape".
"Hello, is this Eric's mom? This is principal Shepard. It seems him and a few boys from school started a negative trend of pulling on other student's shoes, calling it 'shoe-rape' and telling people, 'You got raped!'".