when 2 or more people go along with a lie to 1 or more others for whatever reason. Lie can be premeditated or spontaneous. Generally used to avoid someone or to cover plans made.
1 - "wanna go do something?
2 - "I would but we promised to help our mate fix his PC"
3 - "err, yeah we promised him. soz
1 - "erm, ok. see u later then"
3 - "told u we should of prepared an inside lie, now it looks obvious"
2 - "na its fine, he bought it! lets get a tens