https://www.urbandictionary.com/define.php?term=elbump&defid=5312383
noun - A bumping of the elbows of two bros. A superior alternative to high-fives and fist bumps, especially when one bro's hands are full.
Steve: Rob! Rob: Hey bro. Steve: Elbump? Rob: Elbump! Steve: Awesomeness!