Trying to get someone to see the bright side of their crappy situation, instead of acknowledging their feelings and letting them grieve/ mourn/ be disappointed, etc. A portmanteau of "condescend" and "sunshine."
"So I am confUshun! Why is this one KANSAS, but this one is not ar-KANSAS?!? AMERICA, EXPLAIN!! EXPLAIN!!!! WHAT DO YOU MEAN, ARKENSAW?!?!?!
"This is your math homework: all you have to do is find the square root of the cubic root of x to the fifth power plus half of y divided by z and then multiply the whole thing by y.