I would just like to say: This is not an exploit.
JLF said so.
First you need 200 moneys. 20 kills, easy enough right?
Well, then once you have 200 moneys buy one set of SLAMS (100 moneys for 3) And now you have 3 slams to place at will. Once you have placed all three, why not go to console and type kill TADA 3 more... but wait... that didn't turn out too well... Oh WAIT, if I buy another set because I have 100 moneys, mabye I can use those too! So go ahead and buy, but wait?! You still have your 100 Moneys and 3 more sLAMS?! Wow. uber hax. You can buy more everytime you run out?! (Not recommended to throw them, but place them on a wall so you don't have to detonate them to buy another 3)
JLF said it wasn't an exploit, so have a SLAMming good time!

(I r a lamer, I know.)
And for all of you that want to know how to counter it, throw a nade in the direction, you are bound to blow up alot of them, if not all AND the person placing them. Have a good day.