An action in which one is almost always ready to do a group activity, but when it comes time to show up, they always have a reason not to participate. Most people know or have known a backpedaler at one point or another.
Lily: Oh man, lets all participate in a fun party game or event!
Everyone else: Wow! That sounds like a great idea, lets do it!
Lily: Haha... Actually i don't want to do that, but i'll watch!
Everyone else: You need a new set of tires after backpedaling that hard
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!