(verb) - To appear in favor of an activity until the opportunity to participate in the activity is present.
Friend: "You want to get high this weekend?"
Skiffer: "Oh hell yeah man, im down for it whenever!"
F:"Really? Ive got some right now, lets toke up!"
S:"Oh, I uhhh... have some things to do right now... And i just remembered that ill be out of town this weekend..."
F:"Come on man, you skiff out on me everytime."
S:"Hey, ill do it when im ready."
F:"Youve been saying that for the past year and a half now..."