Taking a double
dose of Ex-lax after eating Mexican food and waiting until it's unbearable, then punching your girlfriend
in the diaphragm, knocking the wind out of her. While she's lying on the floor sucking for air like a fish, unleash the liquidous mess from your anus into her waiting mouth.
Other fish can be used to relate to the person sucking shit matter.
Trout for lesbians, Wide
Mouth Bass for that
who won't shut up, etc.