Not quite. Strictly speaking, this is past plural form, and it's original meaning is "we/you/they left". In your example, it is used as an imperative.Originally Posted by sefbarisovich
Not at all. "Пошли" is neither slang nor facetious or figurative. It simply means "Let's go (right now)". It is THE way to say this in Russian.Originally Posted by sefbarisovich