For those of you that are uninitiated into the world of horrifying sexual atrocities, a blump is a blow job received while taking a dump.  You see, you take the first two letters of BLow job and combine them with the last three letters of dUMP and you get a BLUMP.  

I only know this because Tawhaki barely qualifies as a human being and not only knows what this is, but actually convinced a girl that this was a good idea.  Of course he never spoke to her again after she debased herself in this way.  The dilemma for me is that I can't figure out if he is the anti-christ or my hero...