When you are forced to greet some one who you know is an absolute turd but are compelled to greet them. Like taking a big bight a stinking shit sand which -Usually in a formal or official setting.
I had to greet my ex wife's husband at my daughter 's graduation. Knowing that he is a turd on several levels , and wantes to be as cordial as possible I extended my hand out for a COMEY SHAKE from a safe distance , but got pulled in.
Contemporaneous notes or emails drafted immediately after a one-on-one conversation or meeting with an untrustworthy person who you expect will later lie about what was said in that conversation, and which are stored for future reference, to be possibly used at trial or in other official proceedings.
Holy shit! The boss just asked me to do some shady, unethical things. I need to send a 'Comey memo' to myself in case they later try to throw me under the bus for following through.