Velcro

A person or group of people (students) who suck at sports so much they always end up only getting picked by their semi-velcro friends or get picked last. No one passes to them because they WILL drop the ball. Velcroes can either be nerds or just losers in general, and only about 10% of people know their names, or even know they exist.
OR a slang term for people who are super bad at something (referring to velcro shoes, for when kids can't tie their own shoelaces), a degrading thing to say to that deserving bitch

Person 1: aye mate we're up against the velcro team!
Person 2: aight dude they don't stand a chance

OR

They're such velcroes, they can't even tie their own shoelaces.
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You're such a velcro at art!!