The Brief: This term refers to going all out at a task or activity, usually without thinking through the risks or consequences.

DEEP DIVE
When someone does something “full send” in the context of athletics, they’re giving it 100% effort while also potentially risking injury. Similar to “send it” and “send me“, the term refers to the excitement and/or confidence one might feel.
McNeil went into full send mode pic.twitter.com/DzLJcj1L6T
— Evan Daniel (@mrevandaniel) June 11, 2019
In extended, Gen Z slang, the term often refers to going all out, regardless of the consequences.
FULL SEND pic.twitter.com/Y5rLPTNhs8
— NELK (@NelkFilmz) June 7, 2019
guys do i full send this random descision of mine?
— Evade Blizzard (@Blizzy) June 9, 2019
Full send goals.
I'm 26 Years Old and I just consumed a $1 lunchable for dinner. #FullSend
— Kyle Holderfield (@KholderfHR) June 8, 2019