"Keeping truckin" is an idiomatic expression that refers to persevering through difficulties or challenges. However, if one were to look for antonyms for this phrase, they might consider words such as giving up, surrendering, quitting, or throwing in the towel. Essentially, the antonyms for "keeping truckin" would be words that indicate a lack of perseverance or determination in the face of adversity. It is important to note that giving up is not always a bad thing, as sometimes it is necessary to let go and move on. However, for those who wish to keep pushing forward, "keeping truckin" is a valuable mindset to have.