Shwop is synonymous with the word "not". Often, when complimenting someone or saying something positive, shwop is used as a negative explosion.
"Hey dude, I really like that fedora you have on.....SHWOP!" or "No way dude, you kissed that girl last night? She was really hot... SSSSHHHWWWWOOOOPPPP!!!!!!!!"
by Bismuth Jonathon December 11, 2013