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1.
To affect deeply or completely, as with emotion.
Fan: I'm your biggest fan! I love all of your books! Ohmigosh Here I knitted a sweater just for you!
Author: I..don't know what to say, I'm overwhelmed..t-thank you! *blushes and puts on sweater immediatly*
by Rebanex May 04, 2008
 
2.
to exist in such great amounts that someone or something cannot deal with them.

"In June the town is overwhelmed by tourists."

very intense
An overwhelming sense of guilt
by Alexander Tabalipa May 12, 2009