Foul Snookers and Foul Jaw Snookers
If your opponent has fouled and left you in a situation where you cannot play the finest cut possible on BOTH sides of at least one of your balls, by way of a straight line shot, then you are either "foul snookered" or "foul jaw snookered".
See the examples below.
NOTE: All examples show the fouled player's colour as yellow.