let it rip

[let it rip] {v. phr.}, {used imperatively}, {slang} Don't beconcerned; pay no attention to what happens.

Why get involved?Forget about it and let it rip.

2. (Imperatively) Do become involvedand make the most of it; get in there and really try to win.

Comeon man, give it all you've got and let it rip!