Light post
when a guy is laying on a bed with his erect penis up and she jumps of a diving board and lands on him with her legs spread apart and his penis goes inside her vagina.
yo jerry, my girlfriend gave me the best light post ever.
jerry: thats lit dude!
jerry: thats lit dude!
Light Post
When a guy is about to nut and you can see the cum at the tip.
Jim: "I as fucking your mom last night and she told me I had a nice light post."
Me: "Same."
Me: "Same."