In geometry, an oblique object is one that is distorted so that is seems to 'lean over' at an angle, as opposed to being exactly upright. One that is not oblique and is upright is called a 'right' object. A way to remember which is which is that 'right' objects are 'upRIGHT'. For example see the right cylinder and oblique cylinder below.

The shape is distorted by sliding the top sideways so it is not directly above the bottom. It is not formed by simply tipping it on one corner:

Pages referring to 'oblique'

A cylinder is a closed solid that has two parallel (usually circular) bases connected by a curved surface. It can be a right cylinder or an oblique cylinder.
Definition and properties of oblique cylinders, which are cylinders that 'lean over' to one side. Oppositie of a right cylinder where the sides are perpendicular to the bases. Includes discussion of why the volume does not change.
Difference between a right cone and an oblique cone.
Difference between a right pyramid and an oblique pyramid.
Definition and properties of a prism, showing it to be solid with two congruent parallel faces, and where any cross section parallel to those faces is congruent to them.