phone-a-thon Share definition Flag An intensive fundraising campaign in which callers solicit donations by telephone. Man, that's bad. We should start a phone-a-thon for you so you never have to lose another remote ever again. phone-a-thon by emroflily March 14, 2012 0 0 Get merch Get the phone-a-thon mug. Buy Now — $32.95 See more merch