This is a reference to the song "Post To Be" by Omarion. In the song, Jhene Aiko refers to her booty as groceries. It is a sex term. He eats food and he figuratively eats her ass in a sexual way. It is now a pop culture reference. Instead of ass, one says groceries. Only in a sexual context.
"Might let your boy chauffeur me,
But he got to eat the booty like groceries." -Jhene Aiko
Person one-"Got plans tonight?"
Person two-"Yeah I'm gonna netfix and chill with bae. Hopefully I'll get into the groceries."