Foul Bachelor Frog, sometimes refereed to as "Facebook frog".
The FBF is a well know "meme" on 4chans /b/ random board, it is a picture of a bullfrogs head with a green pattern background, people add text on a website called meme generator that is agreeable and adheres to "foul bachelor behavior". This is one of the most popular memes on the /b/ board as many people who frequent /b/ can relate to it.
The text that people put on the picture is usually in a simple "event" - "reaction" context (see examples)
The text, when done properly usually contains a common, normally undesirable character trait being expressed, such as wearing dirty clothing, "fapping" (masturbating) into a sock, wearing a fapped into sock, microwaving a harddrive out of paranoia, not caring about surroundings, being disoriented about what time it is after an unexpected nap, etc. etc.
(Top) See picture of rotting dick on /b/
(Bottom) Fap 2 minutes later
(Top) Clothing worn once on the floor
(Top) Wake up, see 2:00 on the clock
(Bottom) Look out window to see if AM or PM
You get the gist of it. FBF.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug