As you may note in our “about us” page (see the link above), Radical Reference’s site exists to “support activist communities, progressive organizations, and independent journalists by providing professional research support, education and access to information.” So, our main mission is to provide research assistance for and about social change and issues, broadly defined. At the same time, our question portal is open to everyone, and we have several examples of this sort of popular culture question. Librarians are naturally curious, and many of us are interested in language, so questions about etymology – the history and origin of words and phrases – have occasionally been explored on this site.

That being said, I’m not sure that is is the right forum for this particular question. I can tell you that originally the word “blow,” derived from Old English, referred to wind, and especially the strength of wind. This in turn became associated with explosive bursts, and then by metaphorical association with emotional outbursts. You can trace the history of the word in resources such as the Oxford English Dictionary, which you can find in a local library. There are also a great many Internet sites devoted to etymology, and especially slang, which might be interesting to look at. A good starting place for finding them is Google’s Directory of Etymology Sites, though there are others. You should search for "blow up" as well as "blew up" for the most results. Another interesting connection is the old expression for passing gas, "breaking wind," which makes an interesting connection to a current usage, i.e. "sorry I blew up the bathroom," meaning shall we say having left traces of one's presence. I suspect the origin of this usage is more related to the later meaning for explosive force, but it is interesting to note how the meaning has doubled back closer to the original sense.

But for the very specific type of definition you’re looking for, which is very current popular culture, you might want to try a more informal information site, such as the Urban Dictionary, where you can submit the term, and others will chime in to create a definition, some funny, and some (hopefully) informative. Lastly, while I like many librarians have very serious misgivings about the quality of information you can find at Yahoo Answers - I can say for certain that there is a lot there that is just plain wrong – for this particular question I think you may have more luck there than at Radical Reference.