To form untidy creases or folds in an article of clothing. / (chiefly US, colloquial, idiomatic, somewhat vulgar) To be brave, to show some courage, to keep moving forward in a difficult situation.

creased or folded upwards / piled up in a disorganized manner

simple past tense and past participle of ruck up

Third-person singular simple present indicative form of ruck up

present participle of ruck up