What does it mean when my 10 year old son's friends ask if he "likes fish sticks"?

A term referring to a male Fishs' penis. It's used to make people look like gay fish. Made famous by South Park.

Guy 1: Do you like Fish Sticks?

Guy 2: Yeah!

Guy 1: So, you like to put them in your mouth and chew on them?

Guy 2: Of course!

Guy 1: ..So, you're a gay fish?

Guy 2: ....

it an old south park joke ( tv show on comedy Central) it goes like this

Q-do you like fish sticks

A- yes

what are you a gay fish

its a play one words fish sticks - fish *****

Its from South Park the Adult Cartoon when you say it fast it sounds like

Fish Di*ks

South Park joke. "Do you like fishsticks?" "Yes" "So what are you, a gay fish?" Fishsticks sounds like fishdicks.

its from south park. watch it on youtube