The "nice" way to interrupt someone. Direct quote from Kanye West's infamous interruption of Taylor Swift at the 2009 VMA's.
Zach: "Hey, can I borrow that cologne of yours? I'm taking my girlfriend out to dinner tomorrow night and..."

Tyler: "Imma let you finish, but I have the best girlfriend ever. The BEST. GIRLFRIEND. EVER."
by Olivia8836 October 2, 2009
Get the Imma Let You Finish mug.