An advert that builds up really well to a massive anticlimax, which consequently makes you not want to do/use/be associated with what the advert was about
Hey dude did you see that Co-op express advert? all that building up just to say "we'll just go to Co-op" such an antivert
A person that is only friends/outgoing with themselves, and an introvert to everyone else. Useful to use on an "Erm, acktchually🤓👆" sentence and ending your friendship with your BFFFL.
A: "Why is C such an introvert? I have never seen them with a friend."
B: "Erm, acktchually🤓👆 they are an autovert."