A word originally describing a vehicle that puts out fires. However, in recent times it has come to be used as a replacement for the word "fuck", as removing the "-ire tr-" from "fire truck" will give you fuck.
1) A vehicle which carries firemen and fire fighting equipment to the scenes of fires.
2) A substitute for the word "Fuck", which has risen from a (false) rumor that Soupy Sales said on his kids show "What starts with F and ends with UCK?" Firetruck!
1) The firetruck went to the burning house.
2) Go firetruck yourself.