Namuu~! Temple monks frequently use a particular phrase, 'Namusan', which is a shortened version of the original long religious version.
Since Byakuren is a Buddhist, they made fun of her by yelling out the first part of 'Namusan' in response. Stop picking fights, you drunkard!The Christmas party became just a standard party after all... Like this! You don't even have faith for us to snatch from you!-whazzu say~?!But...
Humans and Youkai, they all look happy...It's quite like Gensokyou.