Green’s Dictionary of Slang

1. (US Und.) fingerprints.

1929		C.G. Givens ‘Chatter of Guns’ in Sat. Eve. Post 13 Apr.; list extracted in AS VI:2 (1930) 132: calling cards, n. Fingerprints.
1949		Monteleone Criminal Sl. (rev. edn).
1950		Goldin et al. DAUL 39/2: Calling card. Fingerprints. ‘Mitt up (wear gloves) on this caper (robbery) unless you want to leave your calling card for the dicks (police).’.

2. (Irish) a euph. for excrement.

1986

J.B. Keane Bodhrán Makers 252: She had reprimanded him once when his donkey had left its calling card at the entrance to the garden.