Lowndes County District Attorney J. David Miller told the Athens Banner-Herald that the 18-year-old grabbed the buttocks and breasts of a woman and was drinking underage at Remerton bar on March 7.
In a written statement provided by his attorney, Mettenberger apologized for his behavior. He said he hopes the woman involved "can move on with her life."
In addition to probation and a fine, Mettenberger is not allowed to drink alcohol or be at any place where alcoholic beverages are sold, is banished from the city of Valdosta and must have no contact - direct or indirect - with the victim, who is said to be a student at Valdosta State University.
Other charges filed in the case -- underage possession of alcohol, disorderly conduct, obstruction and possession of false identification -- were dismissed in exchange for his guilty plea.
UGA coach Mark Richt kicked Mettenberger off the team April 18 following his arrest.