to jib, jibbed, jibber
Skier: We were jibbin' all over the terrain park saturday.
To jib something is to duck out of doing it.
To be a jibber is to let somebody (maybe a friend) down.
To let down all your friends at the last moment is to be a jibbin git.
"I bet you ten quid he`ll jib the footy"
"He never comes to the footy anymore, he`s a right jibber these days"
"He`s rung & said he`s not coming, the jibbin git!"