Glitch plays are ones designed to operate outside the AI of the game module.
I will not go into all the glitch plays that are out there for you might be willing to try them. This to a certain degree is the honor system as simple as I can put it. If you are caught using glitch plays you will face serious consequences.
If you do not know that you are using glitch plays or have questions about if a play is or is not a glitch play then all you have to do is ask. Put the play in question up in detail and the question you want answered.
Penalties that can be placed if found guilty:
1- Written warning placed in the forum and message on your PSN
2- Lose up to 11 players for up to a season
3- Have up to 6 games simulated
4- Be banned from the league from 2 games up to a season
5- Any combination of the above
6- Permanent removal from league (extreme cases only)