A term used to express having something perfected or easily obtainable.
As in: Locked down, perfected,
dialed in,
set in stone, definitely, with out a doubt, for sure, absolutely,
got it down.
"Did you learn
how to type yet?"
" Man I got that sh*t
on-lock! I'm the best!"
"Does your friend paint well?"
"Oh yeah, her skills are on-lock."
"Can you find
propane?"
"I have the best supplier on-lock."