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1.
Exclamitory word used to show intense emotion. Also used as a substitution for the word "damn."
"Daggum it! I stubbed my toe!"
or
"Daggum! She hit me hard!"
by ChickyChica September 20, 2004
 
2.
For those that prefer to not curse with the Lord's name in vain.
"Dag gum, boy stop pickin on me"
by Just Gurl December 08, 2011