Made popular by American musician Mickey Avalon, the phrase derives from a series of exercise videos actress Jane Fonda starred in during the early 1980's to mid 90's (1982-1995). To "Jane Fonda" means to engage in a through and exasperating workout. Thus refers to rough and/or tiring sex.
"more junk in the trunk than a Honda
i know you wanna do the JANE FONDA"
Better known as "Hanoi Jane". This is the bitch who actually went over to Northern Vietnam and gave aid to the enemy Communist soldiers. She also happens to be a liberal; what a suprise.