It's often an invitation to go get something to eat at a restaurant or cafe.

Get a bite means to have something to eat

thanks for your suggestions Gary, I get it ...that word can have different meanings, it'up to the context. and thanks to Marcin: that site is very helpful !!

"get a bite" = "grab a bite"---Please take a look at the link below http://learningenglish.voanews.com/media/video/1654115.html?z=0&zp=1

"get a bite" = "grab a bite" Please take a look at the link below http://learningenglish.voanews.com/media/video/1654115.html?z=0&zp=1 time: 1 minute