Bleep bloop blap is a term often used between friends to fill the silence of a moment, after a joke and/or after a funny sound has been made. This term is usually used in repetition.
*In the club with friends*
*ugly/creepy guy tries to talk to friend*
Friend: Blip Blap Bloop
Other friend: okie dokie Ugly guy: what?
Girls: iykyk *leaves*