A verb, as in "to Krell somebody." Especially popular in Riverdale Illinois. Means: To look someone in the eye, lie your ass off, promise him/her anything (everything), and have no intention of following through. And then tell a (another)lie.
"Please, please, please, I won't Krell you. Just lend me $20 and I'll pay you back Tuesday. Don't believe me? Neither do I. Wait! Do you want to buy a washer and dryer?"