Spiffing rhymes with:
griffing, riffing, sniffing, beefing, bluffing, briefing, chafing, choreographing, coffing, coughing, debriefing, doffing, dwarfing, engulfing, fireproofing, golfing, goofing, griffing, handcuffing, huffing, knifing, laughing, leafing, morphing, offing, photographing, proofing, puffing, rebuffing, riffing, rohlfing, roofing, roughing, ruffing, rustproofing, safing, sniffing, snuffing, spoofing, staffing, strafing, stuffing, surfing, waterproofing
Spiffing sounds like:
sabine's, sabins, safing, saipan's, sapanski, sapiens, sapienza, sapping, savannas, savin's, saving, savings, savings', savings's, saxophones, scavenge, scooping, scoping, sczepanski, seeping, seven's, sevens, shaping, shaving, shavings, shipping, shobana's, shobanna's, shopping, shopping's, shoving, shuping, sieving, siphoning, siphons, sipping, skibinski, skipping, skyhopping, sobbing, sofians, sopping, soybeans, spain's, span's, spang, spanish, spank, spanky, spanning, spanos, spans, spawning, spawns, spence, spens, spewing, sphinx, spinach, spines, spink, spinks, spinks's, spinning, spinosa, spinoza, spins, spong, sponge, sponges, spongy, spoofing, spoons, spunk, spunky, spying, subbing, subpoenaing, subpoenas, supinski, suspense, svensk, svenska, swapping, sweeping, swiping, swooping, sypniewski, szczepaniak, szczepanik, szczepanski