A spelling mistake.  Like the commonly used work typo(meaning a mistake in typing), a spello refers to a spelling mistake.
by Manddo September 27, 2005
 Get the spellomug.
Get the spellomug. Named for Peter Spellos, a prolific B-list actor of unfortunate looks.  Used to connote severe unattractiveness, bordering on the grotesque
"He's not just fugly, he's Peter Spellos Fugly."
or
"Where'd you find Spellos? Shit - you can do better than that!"
or
"Where'd you find Spellos? Shit - you can do better than that!"
by Hartless February 13, 2009
 Get the Spellosmug.
Get the Spellosmug.