The phenomenon that occurs during fellatio where the person performing the blowjob closely resembles a small mammal sucking termites out of a stump. The term can also apply when someone is really enjoying a Popsicle or a banana.
Johnny unzipped his trousers, revealed his manhood and whilst presenting it to the audience proclaimed loudly;
"Everyone, I have an anteater! Check him out."
NB
Male Etiquette: performing the ant eater is only socially acceptable when done so without an erection.