If something is out of your MERLIN (or Mental Realm Capacity) it means that it is out of your understanding, knowledge or comprehension.
Person 1: Hey do you know how this works?
Person 2: No, It's out of my MERLIN
Person 1: Your what?
Person 2: my MERLIN, Mental Realm Capacity
Person 1: What?
Person 2: you wouldn't get it, it's out of your MERLIN
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug