The racist comments on Obama "was an adequate reaction against the one who insulted and defamed PRNK (People's Republic of North Korea)", a spokesperson for the external affairs ministry said in comments carried by the country's official Korean Central News Agency.
The North Korean spokesman criticised the US president for calling North Korea an "isolated state" that "condemns its citizens to hunger" by having a "reckless and irresponsible government" during his last visit to Seoul in late April.
According to the Pyongyang spokesperson, it was an "unpardonable insult against the people of PRNK who are leading a happy life under the benevolent socialist system".
On May 2, after Obama's visit to South Korea, the KCNA carried a lengthy Korean-language diatribe against Obama calling him "evil black monkey" who "even lacks basic features of human beings".
The attack on the US President prompted an angry reaction from the White House and the State Department in Washington, which described it as "disgusting", "ridiculous" and "disrespectful" among other adjectives, and asked North Korean leader Kim Jong-An to "improve the lives of its people" instead of insulting others.
North Korea has recently raised the tone in its official statements, recently launching a diatribe against South Korean president Park Geun-hye calling her a "prostitute".
Although the two Koreas began earlier this year an apparent reconciliation process, Pyongyang's relations with both Seoul and Washington have taken a big blow since the joint military drill conducted this spring in South Korea.