tsukkomi-hand-gesture-iruma-ch54.png

Translation

• Context: Suzuki Iruma 鈴木入間 makes Valac Clara ウァラク・クララ sit on his lap in class. The entire class stares at them. In response, Iruma says:
• nanda yo
  なんだよ
  What is [it]?
  [What are you looking at]?
• mise-mon janee zo
  見せもんじゃねーぞ
  [This] isn't a show.
  • mise-mon - contraction of mise-mono 見せ物, a "thing," mono, that you "show," miseru, others.
• pii
  ぴー
  *head smoke noises*
• Hearing this, Andro M. Jazz アンドロ・ジャズ retorts, making a gesture slapping the air:
• iya, {dou mitemo} mise-mon daro
  いや　どうみても見せもんだろ
  No, {no matter how you look at [it]} [it] is a show.
  
  • iya - "no" in the sense of "no, what you said is wrong:" this is clearly a show, and you're obviously doing it in front of everybody for everybody to see it.