It's not uncommon for these kinds of upsets to happen. Tennessee had lost 11 straight SEC games that dated back to a 45-34 loss at Vanderbilt on 11/25/16. They started 2-3 with loses to West Virginia, Florida, and Georgia by 26 points each, but stunned Auburn 30-24 on the road on 10/13/18 to snap an 11-game SEC losing streak. Also, Tennessee snapped a 15-game losing streak to SEC West teams that dated back to 38-7 loss to LSU at home on 10/15/11. In addition, they got their first SEC road win since a 34-31 win at Georgia on 10/1/16 and first SEC West road win since a 33-21 win at Mississippi State on 10/13/07. Yes, Tennessee throttled Kentucky 24-7 on 11/10/18 before they got embarrassed by Missouri 50-17 at home and Vanderbilt 38-13 to finish 5-7.
Kentucky pounded Florida 27-16 on the road to snap a 31-game losing streak to Florida. A week after Florida lost to Georgia 36-17 on 10/2718, they got embarrassed by Missouri 38-17 for another double-digit SEC home loss. Likewise, Kentucky was coming off a 34-17 loss to Georgia at home on 11/3/18 before getting crushed at Knoxville. Both Florida and Kentucky followed blowout losses to Georgia with disheartening losses to inferior teams, but they both finished 10-3.
Because it is difficult for most teams to win 10 games in a season, I consider a victory over a team that finished with 10 wins a signature win.