deep six

to hide or dispose of something in such a way that it will be extremely difficult or impossible to find or recover, even for the person doing the hiding. get rid of. nautical in origin, it comes from a call indicating a depth of six fathoms (over ten meters), a depth from which recovery of an item tossed overboard would be very difficult.
argggh, matey! deep six the crack pipe before admiral billy-bob catches us.

jimmy-joe, we’d better deep six the whole meth kitchen before andy taylor shows up at the trailer park
to stow something away in place where it will be impossible to find. the six refers to six fathoms (or 36 feet), the minimum legal depth for a burial at sea
james bond was given the deep six in you only live twice
to deep-six means to get rid of, to ignore, or to bury something. it comes from the six feet depth of a grave.
i’m sick and tired of the deal we made. it’s time to deep-six that sh-t.
blowing a load inside a p-ssy.
friend: you f-cked that b-tch last night right?
you: yeah, i blew that sh-t up.
friend: did you use a rub?
you: f-ck no. rubbers are for p-ss-es. in fact i deep six’d that sh-t.
what a j-penese man dreams he could give a woman
tojo wishes he could deep six his woman but he only has 3 inches
the six refers to a grave, as in six feet under.
the deep refers to the ocean.

together we have a death at sea, where youre grave is much futher down than 6 ft. today we just use it to say “throw away” or something like that.
deep six that old couch
death
if you p-ss me off, you’re dead meat, done, deep six.