At Belt: N. A Cable Tie, Esp. The Sawtoothed, Self-locking Plastic Kind That You Can Remove Only By Cutting (as Opposed To A Random Twist Of Wire Or A Twist Tie Or One Of Those Humongous Metal Clip Frobs).

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:rat belt: n. A cable tie, esp. the sawtoothed, self-locking plastic
kind that you can remove only by cutting (as opposed to a random
twist of wire or a twist tie or one of those humongous metal clip
frobs). Small cable ties are `mouse belts'.
-- The AI Hackers Dictionary

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