A fictional astronaut in David Bowie's lyrics. Also, as a metaphor: altered state of consciousness (with or without drugs), people in such state, who lose a sense of reality (have no ground control).
My mama said to get things done you'd better not mess with Major Tom (Ashes to Ashes by D.Bowie).
by Alex Tsarev November 12, 2006
major tom is a heroin addict
that guy is a major tom
by my parents November 10, 2006
the act of one male friend giving another male friend a hand job when he is unable to achieve orgasm otherwise.

Similar to: dutch rudder.
"My wife couldn't get Rob off, so I showed her how it's done and gave him a Major Tom."
by McOweyjo April 22, 2010

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