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A massive release of sexual energy when Lucas M enters the room.

Can also happen when his name is mentioned during general conversation, or if he is actually having sex with you.
Ohhhh myyy godddd I just had the most amazing lucasm today.
by Sarah5565 February 25, 2010
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The highest level of orgasm made possible by a member of the lucas family.
The girlfriend of Lucas was smiling constantly. She obviously experienced a lucasm.
by Matthew R. Lucas January 07, 2008
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