Get off with (someone) British informal slang phrasal verb
If a person "gets off with someone", he/she literally leaves transportation or elevator with someone.
A: Have you met Jane? She has just come back to school from her summer trip. B: "Yep. We came across in a train station and got off with each other.
If a person "gets off with someone", he/she is in a sexual relationship with someone else.
There's a rumor that David has got off with Jose since her last birthday party.
Their marriage ended in divorce because she found out her fiancé got off with another girl.
The verb "get" should be conjugated according to its tense.