(Noun) {baw-stuh n} {suh-loot} ; Telling someone to "Go Fuck Themselves".

This is the respect you give someone when you do not agree with their motives or views.
This is the respect you give someone who tries to threaten or harm you.
This expression came about after the Boston Bombing on April 15, 2013.

Sometimes it can be used as a (verb), meaning to fight. (see examples below)

If someone gives you the "Boston Salute" they are telling you to "Go Fuck Yourself".
Example 1:

Person A: I think we should vote for Hillary Clinton.
Person B: I'm going to have to kindly give you the Boston Salute on that one.

Example 2:

The thief approached the cashier brandishing a knife so the cashier gave him the "Boston Salute".

Example 3:

Son: The bullies at school said I should go home and kill myself.
Dad: Fuck them, go to school tomorrow and tell them, you are giving them a good old Boston Salute then see what they do. If they touch you you have my permission to fight.
by Boston Broseph March 10, 2016
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