JK is a net slang with two meanings: joshikousei ("high school girl") and joushikitekini kangaete ("it's common sense").
Although in the last panel, hubby seems to have decided not to let himself be trapped by common sense.
ah, it's something like "if we think by common sense..."Stuff fried chicken nuggets into a highschool girl's OOO and add mayonnaise!!...The hell is JK?Highschool girls?Why is that highschool girls?Of course fried chicken should go with mayonnaise, you JK.
█████ = Pussy
Munch munchNah... adding mayonnaise to fried chicken is definitely not part of common sense.