English - Idiom - Wanna grab a bite?

Idiom: Grab a bite (to eat)
Meaning: Get and eat food quickly

If you grab a bite (to eat), you get food and eat quickly because you are busy or in a rush.

Examples:

• We have five minutes before the show. Let's grab a bite.
  
• Tim often grabs a bite to eat between meetings.
• Last night, we grabbed a bite before we went to the movie.
• Wanna grab a bite after work?