(SEO) The act of filling a website with keywords in the attempt to boost the website's position in online search rankings.

(telecommunications) The insertion of non-information bits (binary digits) into a data stream.

(computing) A kind of cyberattack in which a large batch of account credentials stolen from one service are tried against another service in an attempt to log in.

(idiomatic) To beat very severely. / (idiomatic) To trounce, outdo, or triumph over.

present participle of stuff the ballot box

(informal, idiomatic) To cause (someone, a team) to lose energy and confidence.

The quality of being stuffed.