Odd sound whenever I jump

In gmod, whenever i jump, it makes this odd sound

http://k002.kiwi6.com/hotlink/r64wn4ur7b

Anyone know what it could be and how to get rid of it?

Thanks.

sounds like kurby taking a shit…

Thanks for the outstanding help.

delete your sounds folder? maybe you added a custom just sound.

Sounds like a bad addon replaced something.