"Just do it"

procrastination [proh-kras-tuh-ney-shuhn, pruh-]

 noun

the act or habit of procrastinating, or putting off or delaying, especially something requiring immediate attention: Eg: She was smart,but her constant procrastination led her to be late with almost every assignment.

Psychologists believe procrastinators often say they "work better under pressure" as a way of justifying putting things off.

Source:http://dictionary.com

Picture credit: http://runeatrepeat.com