When someone posts something within social media to 'mark' their partner/territory, either directly or in response to a reference to or by said partner.
1. Jane (checking in via Facebook): Having a wonderful dinner with my man, Dick.

Jane is giving Dick an Internet Hickey through this action

2. In a thread:

Tom: We should go to the strip club tonight!

Dick: Absolutely...I'm in!

Jane: Dick, why would you want to do that with me at home?

Jane is also giving Dick an Internet Hickey through this action

Jane is all about Internet Hickeys...
by Nykkolai February 23, 2017
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