Phrase used by Special Forces when they are required to show out their identity on an operation or when attempting to impress the opposite sex... "dropping the S-BOMB"
"Does she know what you do for a living?"
"Yeah dropped the S-BOMBmate"
When a director is clearly trying to be clever and force a Chekhov's Gun into their story, but it's painfully obvious what it is.
*obvious twist villain picks up a knife in a dedicated close-up shot*
protagonist: woah! you're clearly gonna kill me with that knife! this director fucking sucks, what a chekhov's atom bomb