The words guevon and haragan are colloquial words found mostly in Latin American Spanish. They both mean lazy.
These words also occur in the Chabacano language. There are however some differences in how these words are used in the Spanish and Chabacano language.
In Chabacano, the word haragan is an adjective meaning glutton. The word guevon meanwhile is an adjective that can mean 'somebody with big testicles' and 'a lazy person'. The word guevon is also colloquial (and offensive) in the Chabacano language and it doesn’t, in fact, appear in the dictionary of Camins and Rolando Arquiza Santos (2010). The word haragan does appear in both these dictionaries because it is not considered colloquial.
Rolando Arquiza Santos defines the word haragan as 'glutton', 'greedy', and 'ravenous'. Camins meanwhile defines it as 'a glutton'. Santos’ dictionary also has the word 'guevos' which he defines as testicles (the more used word though for testicles is bola-bola).
Some people pronounce this word as aragan and some pronounce it as haragan (like h in 'hat'). Note that the last 'a' in haragan has a stress in it. This occurs both when said in the Spanish and Chabacano languages.
A note on the word guevon. This word does not appear in the speech of all Chabacano speakers. It is mostly spoken by people who live in rural areas. The more conventional word for lazy is flojo/floja.