Two clearly heterosexual boys comfortable with their sexuality try to explain the nuances of 'grinding' to the outoftouch old dude, aka the principal. I love how they subtly torment the poor man. "I'm just tying my shoe!" Yeah, not a big deal. After this helpful re-enactment, Brandon took Logan out for dinner, got him drunk and grinded (ground?) the life out of him. Granny peace.