Blowing smoke

[Jessica]

Trying to pretend like youre more important than you are or know something you really dont understand.

[Sonia]

Euphemism for dissembling, spouting nonsense and red herrings or general bullshitting.

[Tanya Shivari]

someone who is a big liar liar pants on fire!

[Couch Potatoe]

It means to leave a situation, such as the pub or workplace.
Its a technique used in the army to leave a situation under the cover of a smokescreen. Usually during tank manoeuvres.