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.
That chick is a masterfellatrix, check out this anteater selfie she just sent me!
The act of hangingones penis out of an unzipped paid of pants.
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.