To advertise/endorse/support something heavily, usually to an irrational extent.

Examples being when people back something so much (style of martial arts, sports team) that they have to bring it up whenever possible and tell everybody how it's the best.

Someone people turn to when they're sad who makes them feel better.

A person who sucks up to a cooler person.

someone who rides another person's nuts
to stalk, to idolize

n. Extremely skinny jeans. Look good, hurt bad.