what nelly is referring to is the spread eagle position. the dance for the "get your eagle on" song requires a female to get low and spread her legs as wide as she can.
"drop down and get yo' spread eagle on biatch!"

"hey hoe, get on yo' back and get your eagle on"
by agent cobra August 30, 2004
Get the get your eagle on mug.
when a girl sucks one guys dick and jerks off two guys on either side of him at the same time making a flapping motion with her hands like an eagle
Jeanne-Marrie loves to get her eagle on with stylez pez and his two friends
by ABC money $$ February 16, 2005
Get the get your eagle on mug.