Since the beginning or from the start of something. Similar to from the get-go.
"Slow down baby / Let you know from the gate I don't go down lady"
- Fat Joe, "What's Luv"

Ted: "How long have you been living next to this gate?"
Will: "From the gate."
Ted: "So if I asked you where you were from, would you say you're from the gate?"
Will: "Hell yeah, I've been from the gate from the gate."
by Nicholas D March 18, 2009
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When you're in a rush to catch a flight at gate 37b but you need to make dash for the toilet.
"Honey, I know we may miss our flight, but please hold my luggage, it's the last call for a departure from gate two."
by Guy Cbk November 9, 2012
Get the Departure from gate two mug.