Skip to main content
Dictionary
Store
Blog
World
Help
Advertise
Chat
System Status
Information Collection Notice
Trademark Concerns
reCAPTCHA Privacy
Terms of Service
reCAPTCHA Terms
Privacy Policy
Accessibility
Report a Bug
Data Request
Contact Us
Security
DMCA
© 1999–2026 Urban Dictionary ®
Mugs
Tees
Hoodies
Pro Customization
Create unique products with your own words and definitions
Preview
Personalize Your Design
Your Word
Your Definition
htg = "Honest-To-God" The use of the term term "HTG" comes from the days when they were developing the atomic bomb in the Manhattan Project. They needed a code word for plutonimum, so they called it "calcium" in all the documents and correspondence. Well, by and by, the scientists found that real metallic calcium had to be used for something in their top-secret research. They were in a bit of a quandary as to what to call the real calcium... they couldn't use the term "real calcium," since that would give away the fact that "calcium" actually was a code word for something else --that is, plutonium. So they settled on the term "HTG calcium" for the real calcium.
Text fits
Save
Cancel