Fisherman's Knot
The promptly tied, mess avoiding, knot made at the open end of a sperm filled condom. The knot is tied quickly upon withdrawal and unsheathing the penis to avoid any leakage of errant cum.
After nutting up full the reservoir end of his lamb skin sheath, Dan quickly pulled out and secured his load with a Fisherman's Knot.
Double fisherman knot
When a girl is giving anal while performing a 69 with two guys both with hooked/curved dicks
Girl 1: I got into a double fisherman knot last night. It was intense!
Girl2: I always wanted to try one of those!
Girl2: I always wanted to try one of those!