Arguably the cheesiest word used to be cute with one's boyfriend or girlfriend. The word exploits the inherent cuteness of the sound of words spoken with a lisp; all words which have an "S" are pronounced with a "TH", thus making the word "kisses" into "kitheth".
Adam: Bby, I'm sry I'm late!
Sami: What happened?!?
Adam: Traffic! Plz don't be mad. Kitheth?