look up any word, like sparkle pony:
 
1.
Technique to make masturbation last longer. When you are beating off just as you are about to bust your nut you stop or slow down for a minute then start beating off again. You can repeat this many times in one session. delayed orgasm.
Thanks for telling me about the thermometer, now I can beat off for hours.
by Chris Reeve August 03, 2009
 
2.
the act of having one finger up a girl's asshole while you engage in intercourse.
"i bang'd her and i rock'd a thermometer."
by L-sos November 13, 2007
 
3.
An oboe, because of its overall thin shape.
I have to practice that solo on the 'ole thermometer.
by pentozali November 10, 2005