Another slang for masturbating, pleasuring ones self or fingering.
May be used in conjunction with beating the pufferfish.
Person A: What are you doing?
Person B: Beating the pufferfish.
Person A: What the actual....?
Person B: You know, spanking the moonface.
Person A: Ah.... I'll leave you to it then.
1. A person whose face is "monged" i.e. a very weird looking person.
2. A website that shows a man inserting a telephone into his anus. A grossout website similar in content to websites such as meatspin and lemonparty.
1. Look at Joe Cole, he is a mongface.
2. That man is performing a mongface ritual with the telephone reciever.
Moonface usually occurs when an individual has been smoking weed. Moonface often leads to mad hysterics, causing everyone on the bus to look at you. Characteristics of moonface are prominent cheeks, small slanted eyes, a massive stupid grin, and faceache.