It's almost like drinking, and then one person says cheers, and then everyone raises their glasses.
Extended data:
The slogan of the website "bili-(゜-゜つロ Come on Bi Li ~" originated from a video on niconico called "Come on niconico". Later, domestic up copied a video celebrating "Come on, Bi Li, Bi Li", which had a great response. Then the official added it to the title of the website on the anniversary.
References:
Baidu Encyclopedia-Bi Li Bi Li