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1.
n.a sweater like shirt worn my males and females
"All I need is a thermal and a white tee"
by doobie-montague April 11, 2005
 
2.
adjective-----not being able to tell people within a four year younger range the truth fearing that they are too young and that you will corrupt them..hahhhahh
Andrea (15 year old): Wow...that college guy is so thermal...he wouldn't tell me what he did last because he thinks that I'm to naive to handle it.
by caroliiiiiii January 13, 2010
 
3.
Thermal can mean 3 different things. the first thing it can mean is to have intercourse with. The second is to Murder or Destroy severly. Lastly thermal means to get or be intoxicated
1.Sex-I'm going to thermal that girl I've been talking to lately

2.Murder or severly hurt-That guy has been pissing me off, he's gonna get Thermal'd

3.Intoxicate-Yesterday me and my best friend got completley Thermal'd at jake's party
by Chris Duran June 22, 2007