1. an expresion of gratitude used primarily as a formal, friendly, social obligation.
2.When used in it's true form (not merely out of obligation) it is an expresion of respect and appreciation to another soul (and simultaneously to all beings) for the unconditional kindness that has been bestowed upon you.
1. (delivery person hands man package) man: "Thank you!"

2. (parents tolerate spoiled bratty kid for 20 years and teach kid how to not be so spoiled and bratty) Kid: "Thank you."
by ss September 17, 2003
Get a thank you mug for your friend Rihanna.
something you say when someone does something nice for you
thank you mrs G for your support
by I forget January 07, 2005
Get a thank you mug for your cat Trump.
Something you should say after receiving a service.
As seen in Animal House:

*smack*
"Thank you sir may I have another"
by Wolfwood September 14, 2003
Get the thank you neck gaiter and mug.
special code words which appear genuine but actually mean fuck you. also see "trust me"
by B September 09, 2003
Get the thank you neck gaiter and mug.