v. phr. , used imperatively , slang Don't be concerned; pay no attention to what happens. Why get involved? Forget about it and let it rip. 2. (Imperatively) Do become involved and make the most of it; get in there and really try to win. Come on man, give it all you've got and let it rip!
LET IT RIP
Meaning of LET IT RIP in English
American idioms English vocabulary. Английский словарь американских идиом. 2012