The kind of dick (sex) a man gives you when you least expect it. It's loud, rough, and generally occurs at early hours
in the morning. It's a reference to wartime (mainly
World War 2) invasions of enemy beachheads that occurred early
in the morning, and involved massive troop movements, intense fighting, and loud explosions. Beachhead dick always ends with both the partners feeling extremely exhausted, shocked, and very sweaty. The girl always submits first during beachhead dick, such as when a enemy beach is invaded and after many hours of intense battle, the enemy is to tired to keep fighting and surrenders.
"My
boyfriend suprised me this morning with some amazing beachhead dick."
"My husband bent me over last night and gave me the most intense beachhead dick I've ever
experienced."
"The sex I had last night was so amazing. It reminded me of this war movie I watched once, it was so loud and utterly
exhausting. It was some real beachhead dick."