A person or group who have no interest in, or oppose space travel, exploration, or colonization in any way. People who wish humans would remain within Earth's gravity well.
These people are wellscum! They are holding back the progress of mankind and endangering our future!
How you respond to someone when they say "thank you" for sending them random unprovoked nude selfies to which they dropped what they were doing and masterbated.
"Thank you," says Heather after she is done masterbating to Geof's random nude selfie. "You're welcum" says Geof.