Green’s Dictionary of Slang

1. (US) something or someone attractive.

1913		DN IV 16: Used by Nebraska students. ‘The hat is just a doodle.’ [...] ‘Her’s a doodle.’.
2012		C. Eble (ed.) UNC-CH Campus Sl. 2011 3: DOODLE — someone cute or endearing.

2. (US) anything completely simple or easy to achieve.

2001		Muse 27 Apr. 🌐 Money Mark puts away his hammer, dusts down his Hammond and pushes the boat out once more. It’s a doodle really for this chap famed more for his Beastie Boy associations than his skill with a piece of 4x2.
2002		J. Whyle ‘B-Grade’ at S. Afr. Film 🌐 Try this: Stand on your kitchen table. Get four or five friends to stand behind you. Relax completely and fall back into their arms. [...] The third time you do it, it’s a doodle.