- If you have a mic, don't use it.
- If a teammate demands you to flash for him, say that you will, then don't flash.
- If your team is setting smokes, throw your smoke earlier/later than the others.
- If a teammate is peeking an angle, wait for him to die then peek to trade, don't double peek with him.
- If your team is rushing, go rush the other bombsite and get kills there.
- rush a bombsite alone without telling anyone else.
- don't give information when you die.
- flash your teammate, then apologize saying it was a mistake (don't do that a lot)

As long as you're getting frags, you can just say that if anyone complains.

- As CT, smoke some entrance or something, flash and rush throught your own smoke.
- Jump peek every corner.
- Use P90 or auto sniper.
- try to flank from behind as much as possible
- Trigger your enemies even more, if they are mad on the in-game chat.
- Be in spots no one expects you to be in (usualy stupid spots)
- If your enemies are really noobs, buy Zeus every round and get kills with it, knife kills also works.
- Try to 360 no-scope, if you're sure that you'll win this round. (Worked twice for me)

Conclusion, be dumb, but get kills, i know it's hard, but making idiots mad is funny :D
also, a DMG+ smurf should be able to do all that against novas :D