A woman past child-bearing age. See, generally, Self, Will, "The Book of Dave"
Hillary Clinton had Chelsea, but now she is an old boiler.
by John Tollefson July 05, 2006
A tarty woman past her prime.
Pat butcher from eastenders,
by Mugwump November 11, 2004
Desperate woman over 40 looking for casual sex with male under 35,commonly found in Kiwis Cardiff
The old boiler is gagging
by billy silly billy April 01, 2010