"If you don't pay your taxes, you're [just] asking for trouble!" "Not studying before an exam is [just] asking for trouble" "Last night I got home at 3AM and my wife was furious at me. I should have known going to that party was asking for trouble..." "asking for trouble" = doing something stupid which you will later regret

The phrase "you're asking for trouble" means that you are saying or doing something which puts you in a situation where something bad could happen to you, it can be both intentional or unintentional. For example; "I'm a dangerous criminal, so I would stop talking to me like that if I were you. You're only asking for trouble" You're asking for trouble, is usually meant as a warning and typical precedes violent behavior.