The phrase suggests a setup that's not permanent or professional, often constructed quickly.

Temporary Setup

'Rig up' implies a certain ingenuity in creating a solution in an emergency or with limited resources.

Use in Emergencies

Primarily used in casual conversation rather than formal writing or speech.

This use hints at dishonesty, suggesting that something is being manipulated unfairly.

Used informally, often to casually accuse someone of cheating or being dishonest.

Suggests someone intentionally altered the course of events.