look up any word, like cleveland steamer:
 
1.
One bad motherfucker, who's ancestors helped William the Conqueror take England in 1081. Mainwarings also enjoy good beer, such as imports or good Budweiser products.
The Mainwairng was one bad mother fucker.
by Joe February 17, 2005
 
2.
A sexy boy who supports Chelsea FC and has a quality, single mate called Kieran.
"He's pretty cool."
"Yeah man. He's totally a Mainwaring."
"Oh true... I wonder if his mate is still single."
"Yes he is."
by Earl Squirrelsons' son March 08, 2013