'Fotten Gaga' means strong and powerful beast also known as party animal.
Chamorro is an Austronesian language spoken by about 50,000 people mainly in Guam, and also in the Northern Mariana Islands and the USA. Chamorro contains a huge number of words of Spanish origin and this has lead some to mistakenly believe that it is a Spanish-based Creole.
Chamorro first started to appear in writing in 1668 when a missionary by the name of Father San Vitores devised a spelling system for the language using the Latin alphabet. Since then various spelling systems have been used.
See collection of useful phrases in the Guam dialect of Chamorro at Omniglot.