After a sentence, either sarcastic or serious when people have started laughing, use 'No seriously' to either show
A) You're serious and want them to stop laughing because it's not funny
or
B) You're taking the piss out of them by not being serious
Synonyms for No, seriously
On this page, you will find 30 slang terms related to No, seriously. Some of the top words include: pisser, G-ups, ono, serias, fer sar, and 25 more.