It's a verb. to stuff - to push something into a small space, often quickly or in a careless way https://dictionary.cambridge.org/dictionary/english/stuff htt

It's a verb. to stuff - to push something into a small space, often quickly or in a careless way https://dictionary.cambridge.org/dictionary/english/stuff https://dictionary.cambridge.org/dictionary/english/stuff As in "I am going to try these credentials quickly and carelessly and see if they get me in."