Some sort of untranslatable pun by Hammer? Many of the Nico Seiga commenters seem nonplussed as well.

しりあすめいたゆかりん = Serious-looking Yukarin.
尻アスめいた紫ん = pronounced the same, but しりあす ("shiriasu" = serious) has turned into 尻アス (尻 = "shiri" = butt, and アス = "asu" = ass?)...I dunno.

Those Ougi eyes...

NinjaPope said:

Some sort of untranslatable pun by Hammer? Many of the Nico Seiga commenters seem nonplussed as well.

しりあすめいたゆかりん = Serious-looking Yukarin.
尻アスめいた紫ん = pronounced the same, but しりあす ("shiriasu" = serious) has turned into 尻アス (尻 = "shiri" = butt, and アス = "asu" = ass?)...I dunno.

There's a "尻アス"　tag on niconico, so it's not just hammer...