Mate

Following his travels with Martha Jones, the Tenth Doctor told Donna Noble that he just wanted a mate. Mishearing him, Donna initially believed that he wanted "to mate" and quipped "you're not mating with me, sunshine", forcing the Doctor to reiterate to the disgusted Donna. (TV: Partners in Crime)

Behind the scenes

 * The Dead Ringers sketch "Doctor Who vs the Cybermen" has the Fourth Doctor (Jon Culshaw) tell a Neomorph Cyber-Leader that they are his "best mate in the whole galaxy" and that he does not care what the Daleks say.