text shorthand for i knew/know what you meant.
used in text, bbm or IM to let the person you're talking to know that you followed what they were trying to say in spite of the typo
ikwypia stands for "i know who you pretend i am." these are lyrics from "Washing Machine Heart" by Mitski. Any cultured person/mitski stan should be able to read this easily.
That girl's status on discord was "ikwypia" shes probably a mitskistan.
I know what you did last Summer is a movie from the late nineties and what happens is four young friend get into a car accident and kill a man they cover it up and then a killer is stalking them.