Coast Guarding 

Motor boating a female or females for an extended period of time. Usually after hours and with women who have large breasts.

Dude, I was Coast Guarding last night with those chicks from the party. I wish I had a life preserver...

Coast Guarding by EdwinNoses November 5, 2012

Coastguarding

The act of finding and enlarging the clitoris for heightened sexual pleasure.
Usually done using a flexible straw, the clitoris is located and by sucking on the straw the clitoris becomes enlarged increasing and intensifying the orgasm for a woman.

The term " Coastguarding " comes from the "search and rescue " of the clitoris.

My bitch got me coastguarding last night before I nailed her.

Coastguarding by phil279 September 26, 2011

Coastguarding

When your lady refuses to shower after pull-out sex and your stray semen line her lovely shores the next day.

Alfy: dude that chick is smoking hot!

Ralphy: I wouldn’t go there. Billy hit that last night and said she’s coastguarding today.

Alfy: freal? I ain’t picky!

Coastguarding by Paradiseboyz November 1, 2021

Mormon coastguarding 

(v) The act of rejecting a man who is trying to engage in Mormon docking with you.

I was trying to Mormon dock my Mormon girlfriend last night, but she kept Mormon coastguarding me. No port of call for me!

Mormon coastguarding by Brigham Young's barrel chest January 1, 2012