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120d = lol! lol! can be written as 101! Mathmatically 101(binary) is 5(decimal). Therefore 101!(binary) is 5!(decimal) The notation '!' is called factorial. 5! (factorial of 5) means 1*2*3*4*5 which is equal to 120. Since 120 is written in decimal form, a 'd' is added to the end of it to form 120d. That's why 120d means lol! (note: 120d has the exclamation mark included, 120d would mean lol!! with two exclaimation marks)
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