All-Blacking 

A synonym for choking in the sporting sense.

A reference to the perceived under-achievements by the New Zealand All Blacks in Rugby World Cup history - always starting favourites, failing in the big games.

Jana Novotna seriously All-Blacked against Steffi Graff in the 1993 Wimbledon final.

Greg Norman was a serial All-Blacker in major tournaments.

New Zealand Rugby team has a history of All-Blacking in Rugby World Cups.

All-Blacking by KnightSmithJones September 12, 2011

All your mates are backing you up 

A phrase used to signify that the subject has little to no support on their opinion

Jimmy: I think that we should all get more homework
John: All your mates are backing you up, trust me!

All your mates are backing you up by Pavement Misuse September 10, 2018