Trevelyan

Origins

Alec Trevelyan is a character in Goldeneye 007. He is also playable in multiplayer.

The weird part

Whoever is playing that character people would chant 'Trevelyany yan yan. YAN YAN.'

Other chants include...

Camy Camy Cam Cam. CAM CAM.'

Swany Swany Swan Swan. SWAN SWAN.'