When a man is fucking his partner doggy style and punches his partner in the back of the head (@ the madulla ablongata) when his partner is about to come, making the brain spasm as his partner comes. Also known as a "donkey punch".
A phrase invented by someone in the 21st century. It doesn't really have a meaning and is usually simply tossed into a conversation to make it more interesting. It often just confuses people and should probably not be used too often. Common uses for it are as a greeting, reply, icebreaker, end to an awkward silence or maybe even an exclamation.
Example 1:
Steve: When are we going shopping tomorrow?
Ryan: I don't know.
Tabitha: Can we go after 2 pm?
Zoe: No because I have a dentist appointment at 2.
Robert: Maybe we should do this another day.
Zach: Yullah Mahullah.
Ryan: Whaaaat?
Example 2:
Annie: Hey Brian!
Brian: Yullah Mahullah.
Example 3:
Sarah: How are you?
Todd: Yullah Mahullah
Example: 4
Andy: Do you want to die?
Bob: Yullah Mahullah.
Example 5:
Mandy: Let's all revolt against the government! They treat us like dirt! Who's with me?!?
Neal: ...
Patrick: ...
Nina: ...
Larry: ...Yullah Mahullah...
Example 6:
Jim: *shoots Ben in the foot*
Ben: YULLAH MAHULLAH!!!!!!
Example 7:
Richard: Yullah Mahullah.
Stacy: Really? Maybe we should go have some coffee tomorrow and talk a bit more about this!
A pikey, a down right scoundrel, scum bag, dirtbag, anything with the word bag at the end defines mcmullan. It is well known that the mcmullans that they often steal from the mcmullan charity. Holding innocent people at ranson until they get the so called charity money.