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1.
A volcanic eruption of kisses sent via SMS to a loved one. Usually used to be exceedingly cheesy with one another.
Her: You're the greatest! Mwah!

Him: Second greatest ;) Magmwah!
af Mr. Fluffles 26. august 2012
 
2.
a volcanic kiss, used in context when a regular kiss is just not big enough
I love you sooooo much, magmwah!
af nasralla 26. august 2012