Especially sexual or sexually related. Something that looks like semen. Can also be used to mean aroused or horny, sexy, or as a discription of something like clothes.
Oooh... The way she's dancing is gettin' me really frothy.
When a dragon decides to bathe, it is customary for them to masturbate aswell. And as most know, a dragon's sperm is deep red, the color of the burning sun of Atlantia IV (where most dragons are born).
Someone (approaching his late 30s quickly) burnt, lacking a straight GF, and smelling of a stuffy basement who also cannot be left alone with playstations or stuffed animals!
He stinks like basement... he's burnt... he's got a pretend bi girlfriend and he's in his mid thirties... he's frothy! Ewww!
Person 1: "Lets get dressed like sloths, feed each other raw eggs and start the revolution! Im feeling fuckin Frothy man!"
Person 2:"I dont know man, im just feeling that frothy today. Sloths give me the creeps"