Geno Smith was allegedly a huge jerk during his arrest on Monday ... with cops saying he threatened them and even told one, "you have a little d***."
Washington State Patrol officers spelled out the allegations in new police documents, obtained by TMZ Sports, claiming the Seattle Seahawks quarterback was combative and argumentative with them through much of the process of his arrest.
In the docs, cops say they pulled over Smith at around 2 a.m. in King County -- just hours after Seattle finished beating the Cardinals in Arizona on Sunday -- after they claim they clocked his Rolls Royce going 96 MPH in a 60 MPH zone.