Green’s Dictionary of Slang

1. to lend, esp. money; thus weed a holler note until mother comes in, to lend someone $100 until their gambling luck changes.

1938		D. Runyon ‘Pick the Winner’ in Runyon on Broadway (1954) 317: I see the guy pull out a long flat leather [...] and weed Herbie a bank-note.
1944		D. Burley Orig. Hbk of Harlem Jive 17: He [...] wanted her to weed him a holler note until his mudder came in.

2. to give, to hand.

1931		Irwin Amer. Tramp and Und. Sl. 194: Weed.– To take money from one’s pocket as a donation to a beggar.
1944		‘Jiver’s Bible’ in D. Burley Orig. Hbk of Harlem Jive.