First word in the dictionary to be used as a verb, noun or adjective. Most times used as a compliment as in "good job" especially in instances involving sexual gratification/accomplishment specifically with females. To "WOW" someone else.
muhallywop is a rare and special virus that makes the person who has it one of the coolest people ever
sam got muhallywop so now alyssa has to be nice to him because of all his new friends that he will make, she's just mad because girls named alyssa are inherently immune. oh well, i'm sure she's happy with her causticum