Slang; from lesbians in the military who have competitions to see who can last longest, the word comes from the sound made by several ladies masturbating at the same time.
The sound of the cadets thrapping in their bunks could be heard across the base.
Thraxing, often used as a verb, denotes the process of collecting anthrax. Such collection efforts may be for malicious or benign usage. One may use “thrax” as a noun to refer to anthrax as it sounds cooler and avoids the negative connotation associated with saying “anthrax.”
“Bro, I was thraxing so hard last night. Collected about 5 pounds of thrax for my undergroundbunker.”
“Congrats bro, I’m proud of you. In thrax we trust.”