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A) ultimately, what really matters is, fundamentally, at all

Example> Then I looked more closely and by gum , found a rainbow lurking in the mist ahead.

Example> But what he was really good at was machines. By gum, he could make them go! He loved anything mechanical, did Walter.

Example> If he were elected , by gum , things would be different

B) in general

Example> When we produce reporters who purport to be devoted to balance and impartiality , by gum , they deliver just that.

Other usages:
"By love, by gum"
"Eat bone by gum"
All examples are not artificial but real life usage from corpus of English (Corpus Of Contempory American English)

by gum, you'd figure it out, by yourself
by hdraw November 09, 2012
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