a contemptible, mean-spirited, or selfish lack of human decency; morally low; without estimable personal qualities; dishonorable; meanspirited; selfish; cowardly.
“What she did was so base.”
“I can’t believe she said that! How base!”
“That was full of base”
As in baseline. When someone does the bare minimum (especially when they think they’ve done well doing so little).
John: “Hey I finally handed in the assignment due for later today. We should go out to celebrate.”
Jane: “Come on, that’s so base.”
Or
Lucy: “I’ve handed in the reports. I’ve done base but hey at least they’re done now.”
Emily: “Hey done is done, who cares if they’re base if it means you don’t need to worry about them anymore.”