“Hello, my colleague and I have discovered two new types of Lymphoma, and we would like to register them.”
“Certainly! Tell me your name, please.”
“Well, I’m Dr. Hodgkins.”
"Great, so we’ll call one ‘Hodgkin’s Lymphoma’. What’s the other doctor’s name? ".
“Dr. Ottovordemgentschenfelde.”
“…OK, ‘Non-Hodgkins Lymphoma’. Done!”
Do the right thing and insist that it be called Ligma.
Why ? (I didn’t understand the joke)
It’s a common bait-and-switch joke. “I have Ligma” “What’s Ligma?” “Ligma Balls!” (The joke being that “Ligma” sounds like “Lick My”)
Maybe you’re familiar with a similar joke: “Hey, do you think it smells like updog in here?” “What’s updog” “Not much, what’s up with you?” (Here, the joke is that “What’s updog” sounds like “What’s up, dawg”)