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1.
The french people from france often refer to french fire engines with this french term
They cheer Les Dennis as it comes towards
"Quick there is a fire call Les Dennis"
by Ultrastrongbiscuits March 16, 2007
 
2.
in forum speak, a Les Dennis is a troll whose activities are mainly confined to private messaging people and being rather infantile.
somebody's being a Les Dennis
by Atari April 05, 2004