I hope I'm still on time! I had meant to post this a couple of days earlier, but couldn't because of the HF20 RC issues.

I'm not sure about a "favorite" word, but I agree with @zen-art that "thingy" is fun! Here in Brazil, we have something similar, "coiso," which is not a word ("coisa" is the word for "thing," but "coiso" isn't a word). It's even crazier when a person informally transforms "coisa" ("thing") into a verb, "coisar" ("to thing"). "Você tem que coisar aquele coiso!" Would translate to something like, "You have to thing that thingy!" And somehow the other person understands exactly what needs to be done :D .

I don't like swear words, mainly the stronger ones like... you know, the "F" word and the "SH" word. I get that it's normal to feel the urge to curse when something bad happens. But I especially dislike when people decide to throw these words left and right in normal conversation and use them to replace anything. Something like, "Let's finish this sh***..." I'd prefer if they would use "thingy" instead! :P