Dogecoin is an alternative cryptocurrency (altcoin) that uses the iconic Shibu Inu dog from the Doge meme as a mascot. Similar to Bitcoin and its derivatives, Dogecoin can be mined and exchanged for goods and services among the participants, though it is programmed to level out at a higher threshold of up to 100 billion coins and prevent any use of special bitcoin-mining equipment like ASICs. In comparison, Bitcoin will cap out at 21 million coins and Litecoin will support up to 84 million coins in circulation.
Definition #2 for "dogecoin"
Dogecoin is a cryptocurrency featuring a likeness of the Shiba Inu dog from the "Doge" Internet meme as its logo.