A fargler (i.e., one who fargles) is one who participates, or attempts to participate, in the following described activities: One male performing sodomy on another, and when on the point of ejaculating, he "lets loose" inside of his partner's anus. He then positions himself under the partner with the semen lodged in his anus. This partner then flatulates out the sperm, and the man under him receives it in his mouth. He then gargles with the semen.
That guy is such a fargler.