To strike ones penis against anothers forehead resulting in an audible "thump". Often used to test the erection level of the penis.
Just before Luke put his penis in Megans mouth, he performed a density check to test that he had a full erection.
de Lexicon Lenny 3 avril 2003
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
Can you define these popular missing words?