"Saturday Night Fever" tag -_________- ?
It's just Suika and Tenshi imitating one of Nagae's lightning attacks...
"Are your eyes just for decoration baka ?!"

It's more of a meme / in joke than anything, but yeah.
http://beegee.tv/images/saturday-night-fever.jpg

Is it really supposed to be a copyright tag though? No other meme is.

Most other memes don't directly parody things to this extent, and even if they do, the subject of parody is often given a tag of it's own, so I don't see why not.

Windwaker said:
"Saturday Night Fever" tag -_________- ?
It's just Suika and Tenshi imitating one of Nagae's lightning attacks...
"Are your eyes just for decoration baka ?!"

Indeed but Nagae posse was bassed on saturday night fever