A lie or not true... derived from Bullshit/bullish.
She's full of ishness about her being sick.
If someone tells you something you know isn't true... You can respond with "ishness". The same context as "Bullshit"
Gay, as in video games and sports. You use stuff and make actions that are no skill and take no skill to use. Ex) elite barbs, e gaint, lumberloon, mega knight, sparky in clash royale deck. Ex in sports) cherry-picking in soccer
Holy that sparky did 1200 damage to the crown tower! That’s so ish/ishy/ishiness.
Someone that is of low intelligence, annoying and/or crazy.
man, that guy was being so letwat-ish.