Dicknature
Writing your signature in such a way that it resembles an erect penis.
Barack Obama has a great dicknature.
Dicknature
When a man rolls over after sex and applies his wet penis onto the sheets, when he rolls back over he has left his DICKNATURE. Very similar to writing your signature, however with a wet dick.
After morning sex, my man rolled over for a 10 minute snooze before work. When he got up I noticed his dicknature was left behind...