Rip into
Definition 1 of 2
Pro Tip 1/3Action Intensity
Describes doing something with energy and without hesitation. 
After winning the competition, she ripped into the celebration party.
Pro Tip 2/3Eager Anticipation
Implies eagerness and excitement about starting or discovering something. 
He ripped into the new video game the moment he got home.
Pro Tip 3/3Quickness
Indicates that the action is done very quickly. 
As soon as the meeting ended, Julia ripped into her lunch.