Uh. I don't know about "aweseomesauce" but the first time I ever heard "weaksauce" was when one of my teachers said it my Sophomore year. Weaksauce has always been a real world term for me. Don't know it's origins but seeing as how I first heard the term in real life 5 years ago, I never ever assumed it was an internet term. And I don't think it is.