the words sincere and serious together to indicate something such as a sentiment which is seriously sincere.
I'm Sinserious about this; I'm utterly convinced he did it.
by George D T June 08, 2007
a combination of the words sincere, and serious. used to convince someone that you mean what you say.
Johnny: You look beautiful.
Susie: oh, you don't mean that!
Johnny: I'm being sinserious.
by bobillard richardsonly July 11, 2010

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×