"let it come" is what other guys shout when you say "I'm gonna cum" while another dude is sucking your dick.
Matt said "I'm gonna cum" before he blew his load into my mouth -- and another dude shouted "let it cum" !
by USAF Cadet July 9, 2021
"Let it out -- cum !" is what the guy who is jacking you off says to you when he knows you're getting close to blowing your load.
Matt was jacking me off, and when he said "Let it out -- cum !" -- I shot my load everywhere - it hit my face!
by USAF Cadet July 18, 2021
Half way through s*x “you really won’t let me cum inside you” - Phil followed by indistinguishable dirty talk in Greek.