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 9, 2012
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A chewy, sticky wad of flavored sugar (or sorbitol or xylitol if it's sugar-free, smarty-pants) that may come as a ball, a stick, a cube, a 6-foot strip in a pink plastic dispenser, etc. Typically flavored as either classic bubblegum, a fruit (juicy fruit, strawberry, watermelon, orange, kiwi, pineapple, dragonfruit, etc.), or some kind of mint (peppermint, spearmint, wintergreen, winterfresh, sweetmint, smooth mint, polar ice, fresh mint; the list goes on. What's the difference? Don't ask me.). Common uses include sticking it under desks, putting it in people's hair, playing with it as slime, using it as a currency/bribe, breath freshener, etc.
Person 1: You got any gum?
Person 2: Yes. Mint gum. $1 per piece.
Person 1: What?! THAT'S SO -- Okay. *hands over dollar*
Person 2: Nice doing business with you. *takes dollar, then takes chewed gum out of mouth and sticks it on Person 1's hand*
by Falling Upward January 23, 2020
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An imaginary aliment suffered occasional by office employees. Actually an acronym that stands for "gotta use my sick-time." Used to describe someone who calls in sick without actually being sick simply to use up sick time before it expires.
"Bob is out sick today? I hope it's nothing serious"
"Nah, I think he just has a case of The GUMS"
by TheAdamBomb13 November 13, 2018
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something you chew on when your bored in class
i've been chewing 3 pieces of gum for the past 4 periods
by gemini18 November 16, 2007
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Ricky, who was already late to work, popped some Dentyne gum to cover up last night's halitosis.
by Matt (dojo master) October 16, 2012
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Putting drugs between your gums and your mouth walls for a slow dispersion of the drug.
I got a two 50s, might try gumming them tonight.
by GrinchThatStoleTheElection January 21, 2017
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