The act of "forgetting" to pay the tip; also known as "skip the tip." Similar to dining and ditching, but done solely with tip. Most tip & dips take place during valet claims, or other prepaid services and feature quick getaways in hopes of skipping the shame that comes with not paying the tip.
carly: do you have enough money for the vallet tip?
erica: naw, let's just tip & dip!