S.U.V. is an acronym for "Sports Utility Vehicle". This is like a giant car for stupid rich people to show off their money.
One brand of S.U.V. is the "Hummer". It is a copy of the Hummer used by the U.S. Army in the Middle East. The Hummer is a big armored jeep.
"Jeep" is an expression based on the acronym "G.P.", which means "General Purpose" vehicle. The word "jeep" (G.P.) also comes from the U.S. Army.
